Medium Undead (Elf), Lawful Evil
Armor Class 27 (natural armor)
Hit Points 500 (40d8 + 280)
Speed 60 ft.
STR
12 (+1)
DEX
26 (+8)
CON
27 (+8)
INT
29 (+9)
WIS
18 (+4)
CHA
22 (+6)
Saving Throws CON +17, INT +18, WIS +13
Skills Acrobatics +17, Arcana +27, Deception +15, History +27, Intimidation +15, Perception +13, Stealth +17
Damage Vulnerabilities Fire
Damage Resistances Lightning, Psychic
Damage Immunities Cold, Necrotic, Poison; Bludgeoning, Piercing, and Slashing from Nonmagical Attacks
Senses Truesight 120 ft., Passive Perception 23
Languages Abyssal, Common, Deep Speech, Draconic, Dwarvish, Elvish (Loross), Primordial, Sylvan, Undercommon
Challenge 30 (155,000 XP)
Proficiency Bonus +9
Traits

Special Equipment. Araeglos wears the ring of winter and wields an ancient moonblade known as the blade of winter. See the section "Blade and Ring of Winter" below for more information. 

Aura of Frost. Araeglos eminates an aura of bitter cold, which extinguishes all nonmagical flames within 15 feet of him, causes the ground within 15 feet of him to count as difficult terrain for creatures other than him and causes creatures within 15 feet of him to take 18 (4d8) cold damage at the start of each of their turns.

Greater Bladesong. As long as he is not incapacitated, Araeglos always is under the effect of a bladesong, which grants him the following effects:

  • He has advantage on Dexterity checks and Dexterity saving throws.
  • He can add his intelligence modifier (+9) to the damage dealt by his weapon attacks.
  • He can add his intelligence modifier (+9) to any Constitution saving throw he makes to maintain concentration on a spell.
  • He can use a melee weapon as a spellcasting focus.

Legendary Resistance (3/Day). If Araeglos fails a saving throw, he can choose to succeed instead.

Magic Resistance. Araeglos has advantage on saving throws against spells and other magical effects

One with the Ice. Araeglos can see through areas heavily obscured by snow normally, and can move across and climb icy surfaces without an ability check. Difficult terrain composed of ice or snow doesn't cost him extra movement.

Reactive. Araeglos can take one reaction on every turn in combat.

Rejuvenation. If he has a phylactery, Araeglos gains a new body in 1d10 days, regaining all his hit points and becoming active again. The new body appears within 5 feet of the phylactery.

Spellcasting. Araeglos is a 20th-level spellcaster. His spellcasting ability is Intelligence (spell save DC 26, +18 to hit with spell attacks). Araeglos has the following wizard spells prepared:

Cantrips (at will): blade wardchill touch. shape water, frostbite, mage hand, prestidigitation, sapping sting

1st level (at will): absorb elements, armor of agathys, frost fingers, grease, magic missile, shield, silvery barbs

2nd level (at will): cloud of daggers, earthbind, immovable object, mirror image, rime's binding ice, wither and bloom

3rd level (at will): animate dead, counterspell, dispel magic, haste, pulse wave, sleet storm, spirit shroud

4th level (3 slots): blight, dimension door, ice storm, resilient sphere, sickening radiance

5th level (3 slots): danse macabre, cone of cold, negative energy flood, scrying, steel wind strike

6th level (3 slots): flesh to stone, globe of invulnerability, Otto's irresistible dance, wall of ice

7th level (3 slots): crown of stars, finger of death, forcecage, plane shift

8th level (2 slots): Abi-Dalzim's horrid wilting, control weather, feeblemind, power word stun

9th level (2 slots): foresight, meteor swarm, time stop, wish

Soul of the Glacier. When Araeglos casts a spell that deals damage, he can change the spell's damage to cold, bludgeoening, piercing or slashing. In addition, Araeglos can maintain concentration on two spells at once.

Turn Immunity. Araeglos is immune to any effect that turns undead.

Actions

Multiattack. Araeglos makes three attacks with his Blade of Winter and casts one spell with a casting time of one action. If available, he can use Tomb of Eternal Frost instead of casting a spell.

Blade of Winter. Melee Weapon Attack: +20 to hit, reach 5ft., one target. Hit: 24 (1d8 + 20) slashing damage if used with one hand, or 25 (1d10+20) slashing damage if used with both hands,  plus 18 (4d8) cold damage and the target must make a DC 18 Constitution saving throw or be frozen with rime and have its movement speed reduced to 0 until the end of its next turn. Creatures immune to cold damage are immune to this effect.

Icicle Spear. Ranged Spell Attack: +18 to hit, range 300 ft., one target. Hit: 18 (4d8) piercing damage plus 18 (4d8) cold damage and all creatures within 10 feet of the target must make a DC 26 Dexterity saving throw, taking 18 (4d8) cold damage on a failure or half as much on a success.

Tomb of Eternal Frost (Recharge 5–6). Araeglos touches a creature within 5 feet of him, which must make a DC 26 Constitution saving throw. On a success, the creature breaks free from the ice that starts building up around it and nothing else happens. On a failure, the creature takes 36 (8d8) cold damage and is entombed in a thick layer of ice. A creature encased in ice is stunned, has total cover against attacks and other effects outside the ice and at the start of each of its turns, it gains a level of exhaustion and takes 36 (8d8) cold damage.

The creature can repeat the saving throw at the end of each of its turns, freeing itself on a success. The creature is also freed if the ice is destroyed by dealing at least 60 points of fire damage to it.

Snow-Elven High Magic (1/day). Araeglos delves into long-forgotten rituals and methods of casting and manipulating the weave, unleashing magic of unimaginable power. He upcasts one of his spells as if he was casting it with a 10th-level spell slot. When he does so, he can choose one of the following effects to apply to the spell:

  • If he targets himself or friendly creatures, each creature targeted by the spell or included in its area of effect gains 60 temporary hit points in addition to any temporary hit points granted by the spell itself and is under the effect of a bless spell for one minute.
  • If he targets hostile creatures, each creature affected by the spell takes an additional 36 (8d8) cold damage and must make a DC 26 Charisma saving throw or is under the effect of a bane spell for the next minute.
Bonus Actions

Winter's Curse. Araeglos targets a creature within 30 feet of him. The target must make a DC 26 Constitution saving throw. On a failure, it is cursed. While cursed in that way, it can no longer benefit from any resistance to cold damage, can no longer regain hit points and when it dies, it rises as a coldlight walker under Araeglos's control at the start of its next turn.

A cursed target can repeat the saving throw at the end of its turn, ending the effect on itself on a success. Alternatively, the effect can be ended by a remove curse spell or similar spell that can end curses. The curse also ends when Araeglos curses a different target.

Blizzard (Recharge 5–6). Araeglos empowers his Aura of Frost, turning it into a fierce blizzard until the start of his next turn. While empowered, the aura's radius is increased to 30 feet, the area becomes heavily obscured by snow and counts as difficult terrain, and strong winds automatically disperse fog, mists and similar phenomena. In addition, any fire damage dealt to a creature within the area is halved.

Each creature that starts its turn in the area takes an additional 9 (2d8) bludgeoning damage and must succeed on a DC 26 Strength saving throw or be pushed up to 10 feet away from Araeglos and knocked prone.

Reactions

Winter's Aegis. When Araeglos takes damage, he can use his reaction to expend a spell slot, reducing the damage by an amount equal to five times the spell slot's level.

Legendary Actions

Araeglos can take 5 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. Araeglos regains spent legendary actions at the start of its turn.

Icewind Strike. Araeglos makes one attack with his Blade of Winter or with his Icicle Spear and moves up to his speed.

At-will Spell. Araeglos casts one of his at-will spells.

Frost Step (Costs 2 Actions). Araeglos teleports up to 120 feet to a space he can see. All creatures within 10 feet of the space he left need to make a DC 26 Constitution savng throw, taking 36 (8d8) cold damage on a failure or half as much on a success. In addition, creatures that fail the saving throw are frightened by Araeglos until the end of their next turn.

Ring of Winter (Costs 2 Actions).  Araeglos expends one or more charges to cast a spell from the ring or to use one of its other abilities.

Cold Burst (Costs 3 Actions). Araeglos emits a burst of freezing cold. Each creature within 30 feet of him must make a DC 26 Constitution saving throw. On a failure, it takes 54 (12d8) cold damage, cannot take reactions until the start of its next turn and gains a level of exhaustion, on a success it takes half as much damage without any other effects.

Description

A long time ago, long before the Spellplague struck the world, Araeglos was a well-received, good-hearted king of a snow-elven empire, residing in a great palace built of white marble and magical ice, towering over the central city and its adjacent frozen lake. He was a master of the arcane and a master of the blade, probably one of the greatest of his time, powerful enough to practice mythical elven high magic - and probably one of the first masters of the bladesong. His beautiful songs and dances in great battles were widely regarded.

However, over thousands of years, something dark rose within the king and started corrupting him. Not only did he start studying the forbidden arts of necromancy, his attitude started changing too. The once so perfect and likeable king, who did everything for his folk, slowly turned into a ruthless tyrant....

The kingdown now lies in ruins and its inhabitants have fled a long time ago.  But Araeglos, now known as the Lich King of the North, stayed, continuing his dark rituals. What actually was the cause of his corruption, what he actually tries to achieve, noone knows it. But there are rumors that he has lost his own will a long time ago, that whatever he did and still is doing is dictated by a powerful being, older than the gods themselves, imprisoned far beneath the eternal ice of the north a long time before the first snow elves settled there...

Once known for his flawlessness and beauty, Araeglos now appears decayed, rotten, his once precious robe is torn, his once gleaming mithril armor is rusty and dented, his scepter is bent and gems are shattered, and instead of radiating an aura of purity, he now brings decay, fear and death. And frost. His once beautiful songs are filled with darkness and mourning and his sword, the ancient moonblade known as the blade of winter, once was a symbol of royality, of glamour and of hope, but nowadays it is feared amongst adventurers. His body is completely and entirely made of pure ice that has replaced his rotting flesh over thousands of years. He has become eternal like the eternal ice, and this eternity now must be broken by a party of brave adventurers...

Blade and Ring of Winter

Araeglos has two powerful artifacts in his possession, two royal insignia of the fallen kingdom: the ring of winter and the blade of winter, which is a moonblade.

The blade of winter has an ornate mithril hilt with a sapphire inlaid in its pommel and the coat of arms of the fallen snow-elven empire set in the center of its crossguard. Its blade is made of pure ice and is inscribed with seven runes, which grant the following benefits:

  • The sword grants a +3 bonus to attack and damage rolls made with it.
  • The sword has the finesse property.
  • The sword functions as a staff of frost.
  • The sword functions as a sword of the paruns.
  • The sword deals an additional 2d8 cold damage on a hit.

If a creature is attuned to both the ring of winter and the blade of winter, it gains the following benefits:

  • The blade of winter's additional cold damage on a hit increases to 4d8.
  • A creature hit by the blade of winter must make a DC 18 Constitution saving throw or be encased in ice and has its movement speed reduced to 0 until the end of its next turn.
  • The ring of winter's amount of charges is doubled to 24.
  • When using an action to create an ice object or an animated ice creature, two creatures or objects can be summoned at once, provided enough charges are expended.
  • The spell blade of disaster can be cast as a bonus action, dealing cold damage. Once this property has been used, it cannot be used again for 7 days.

Lair and Lair Actions

The Lich King's Lair

Araeglos still resides within the ruins of the great palace of the once glorious empire. The great gate has fallen a long time ago, and most parts of the building have collapsed, but the central hall, once the throne hall of the king of the snow elves, with the mighty Throne of the North and its beautiful pillars of ice and marble still stands. Some doorways to the palace's other wings like the library still are passable, but characters need to watch out for danger. Probably the most likely location to encounter him though is the crypt beneath the palace, the final resting place of the kings that ruled over Rhivendor before Araeglos came. This place that eventually became his ritual chamber...

Lair Actions

On initiative count 20 (losing initiative ties), Araeglos can take a lair action to cause one of the following magical effects; Araeglos can’t use the same effect two rounds in a row:

  • Glacial Fissure. Araeglos targets a point he can see within 150 feet of him. A crevasse, up to 120 feet long, 10 feet wide and 60 feet deep, opens up. Each creature within the area of the fissure must make a DC 20 Dexterity saving throw or fall in, taking fall damage and landing prone. On a success, the creature moves with the ledge of the fissure. The fissure is permanent, emits bitter cold, freezing fog, and a creature that ends its turn within the fissure or not more than 30 feet straight above it takes 18 (4d8) cold damage.
  • Icicles. Araeglos causes large icicles to drop from the ceiling. All creatures he can see within 150 feet of him must make a DC 20 Dexterity saving throw. On a failure, they take 18 (4d8) piercing damage and 18 (4d8) cold damage and are knocked prone. On a success, they take half as much damage without any other effect.
  • Snow Penitentes. Araeglos targets a point he can see within 150 feet of him. In a 40-foot-radius centered on that point, the ground freezes over with sharp and jagged spikes of ice and frozen snow. The area counnts as difficult terrain, and when a creature moves into or within that area, it takes 5 (1d8) piercing and 5 (1d8) cold damage for every 5 feet it travels. In addition, if a creature is concentrating in the spell’s area, the creature must make a successful DC 20 Constitution saving throw at the start of its turn or lose concentration. The effect lasts until Araeglos takes this lair action again or until he dies.
  • Blessing of Eternity. Araeglos reaches for the power frozen within the eternal ice. He regains 60 HP and restores a spent spell slot of a level equal to 1d8. If he has no spent spell slot of that level, he does not restore a spell slot.

Regional Effects

The region around the lair of the Lich King of the North is warped by his magic, which creates one or more of the following effects:

  • Temperatures are unusually cold and blizzards are common within 10 miles of the Lich King's lair, being more fierce and lasting longer than usual blizzards. Creatures may gain one or more levels of exhaustion if they can't protect or shelter themselves.
  • Zombies and other undead rise from the ice within 5 miles of the lair. Their bodies appear to at least partially are made of ice and thus they are immune to cold damage.
  • Crevasses are a common hazard within 3 miles of the lair. Some of them are hidden beneath a fresh layer of snow, some of them have swallowed parts of the ruins of the former kingdom, some may open right beneath travelers' feet...
  • The area within 1 mile of the lair is covered with nonmagical darkness. Since the fall of the kingdom, the sun has never shone in this place, and no aurora flickers over the sky to provide illumination. Coldlight walkers, the undead remnants of unfortunate adventurers that succumbed to the eternal frost, that roam the area, are the only sources of light. Divination spells cast within that area or targeting locations or creatures within that area, fail, unless they were cast by the Lich King of the North himself.

If the Lich King of the North is killed, these effects fade over the course of 1d10 days.

 Variant: Nimgoroth, the Lich King's Mount

If you want to provide an even greater challenge to your players, then you can introduce Araeglos's mount. Nimgoroth, the name translates to White Horror in the common tongue,  is an ancient white dracolich, and a faitfhul servant of Araeglos, obeying his commands in combat with no objection. It used to be a normal dragon dwelling in the glaciers near the peak of the highest mountain of the fallen kingdom, but the Lich King of the North has cursed it, taking the dragon's own will away and binding it to his service, and in the process, Nimgoroth, twisted by these dark, evil forces, became a dracolich. In a similar fashion to what happened with Araeglos himself, the rotting flesh of Nimgoroth's body got partially replaced with ice.

Araeglos will ride Nimgoroth into battle, they each have their own initiative. During combat, Araeglos may dismount Nimgoroth and later mount him again by using either just movement or, if Nimgoroth is flying, by teleporting, either from his back to the ground or vice versa. Whether Araeglos is riding the dragon or not, Nimgoroth always obeys his commands, which Araeglos can issue telepathically at all time. If the Lich King is destroyed, and only then, the curse is lifted, Nimgoroth slowly reverts back to a normal dragon, regains its own consciousness, is frightened for 1 minute and will act on its own, that might include trying to flee into the mountains, towards his old lair.

Nimgoroth uses the ancient white dragon statblock with the following changes:

  • Type. The dracolich's type changes from dragon to undead, and it no longer requires air, food, drink or sleep.
  • Damage Resistance: Nimgoroth has resistance to fire damage.
  • Damage Immunities: Nimgoroth is immune to cold, necrotic and poison damage as well as to bludgeoning, piercing, and slashing damage from nonmagical attacks.
  • Condition Immunities: Nimgoroth can't be blinded, charmed, deafened, frightened, grappled, paralyzed, petrified, poisoned or  stunned. It also doesn't suffer from exhaustion.
  • Magic Resistance: The dracolich has advantage on saving throws against spells and other magical effects.
  • Turn Resistance. The dracolich has advantage on saving throws against any effect that turns undead.
  • Lair Actions:  Nimgoroth shares his lair with Araeglos. He takes his lair actions at initiative count 10, losing initiative ties.

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Monster Tags: Prince of Elemental Evilundeadelfhumanoid

Habitat: Arctic

Semako

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