Arthas Menethil, the Lich King

• Legendary Resistance (3/Day): If the Lich King fails a saving throw, he can choose to succeed instead.
• Magic Resistance: The Lich King has advantage on saving throws against spells and other magical effects.
• Magic Weapons: The Lich King’s weapon attacks are magical.
• Regeneration: The Lich King regains 20 hit points at the start of his turn if he has at least 1 hit point.
• Adamantine Plate: Critical hits against The Lich King are treated as normal hits.

The Lich King is a 20th-level spellcaster. His spellcasting ability is Charisma (spell save DC 23, +15 to hit with spell attacks). He can cast spells from the anti-paladin spell list.

Unholy Smite: When you hit a creature with a melee weapon attack, you can expend one spell slot to deal necrotic damage to the target, in addition to the weapon's damage. The extra damage is 2d8 for a 1st-level spell slot, plus 1d8 for each spell level higher than 1st, to a maximum of 5d8. The damage increases by 1d8 if the target is a celestial or a fey, to a maximum of 6d8.

Spellcasting Ability:

Charisma: Spell save DC 23, +15 to hit with spell attacks

Cantrips (at will):

• Chill Touch
• Thaumaturgy
• Toll the Dead

1st level (4 slots):

• Armor of Agathys
• Inflict Wounds
• Hellish Rebuke

2nd level (3 slots):

• Darkness
• Hold Person
• Mirror Image

3rd level (3 slots):

• Animate Dead
• Bestow Curse
• Counterspell

4th level (3 slots):

• Blight
• Phantasmal Killer
• Staggering Smite

5th level (3 slots):

• Cloudkill
• Destructive Wave
• Contagion

6th level (1 slot):

• Circle of Death
• Harm

• Multiattack: The Lich King can make three attacks with Frostmourne.
• Frostmourne: Melee Weapon Attack: +16 to hit, reach 10 ft., one target. Hit: 13(2d8 + 11) slashing damage plus 9 (2d8) necrotic damage. The target must succeed on a DC 21 Constitution saving throw or its hit point maximum is reduced by an amount equal to the necrotic damage taken. This reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.
• Death Coil (Recharge 5-6): Ranged Spell Attack: +16 to hit, range 120 ft., one target. Hit: 45 (10d8) necrotic damage, and the Lich King regains hit points equal to half the amount of necrotic damage dealt.

The Lich King can take 3 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. The Lich King regains spent legendary actions at the start of his turn.

• Attack: The Lich King makes one attack with Frostmourne.
• Frightening Gaze (Costs 2 Actions): The Lich King fixes his gaze on one creature he can see within 10 feet of him. The target must succeed on a DC 21 Wisdom saving throw or become frightened for 1 minute. The frightened target can repeat the saving throw at the end of each of its turns, with disadvantage if the Lich King is within line of sight, ending the effect on itself on a success.
• Frost Aura (Costs 3 Actions): The Lich King releases a burst of icy energy. Each creature within 30 feet of him must make a DC 21 Constitution saving throw, taking 45 (10d8) cold damage on a failed save, or half as much damage on a successful one.