Legendary Resistance (3/Day). If Valdemar fails a saving throw, it can choose to succeed instead.
Magic Resistance. The Valdemar has advantage on saving throws against spells and other magical effects.
Innate Spellcasting. Valdemar's spellcasting ability is Charisma (spell save DC 19). He can innately cast the following spells, requiring no material components:
1/day each: invisibility, legend lore, protection from energy, true seeing, shapechange
Spellcasting. Valdemar is an 8th-level spellcaster. His spellcasting ability is Wisdom (spell save DC 18; +10 to hit with spell attacks). He has the following druid spells prepared:
Cantrips (at will): druidcraft, mending, produce flame
1st level (4 slots): healing word, detect magic, entangle, speak with animals
2nd level (3 slots): animal messenger, pass without trace
3rd level (3 slots): dispel magic, plant growth
4th level (2 slots): blight, locate creature, stoneskin
Multiattack. Valdemar can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.
Bite. Melee Weapon Attack: +15 to hit, reach 15 ft., one target. Hit: 19 (2d10 + 8) piercing damage plus 9 (2d8) acid damage.
Claw. Melee Weapon Attack: +15 to hit, reach 10 ft., one target. Hit: 15 (2d6 + 8) slashing damage.
Festerwood Swarm (1/Day). Valdemar fills up to ten 10-foot cubes with Festerwood Scarabs Every cube must be within 150 feet of the lich and occupy a space the lich can see, and each cube must have at least one face adjacent to the face of another cube. Each creature in the area must make a DC 19 Dexterity saving throw, taking 38 (7d10) necrotic damage on a failed save, or half as much damage on a successful one.
Wither. Ranged Spell Attack: +9 to hit, range 60 ft., one target. Hit: 14 (4d6) necrotic damage.
Frightful Presence. Each creature of Valdemar's choice that is within 120 feet of the dragon and aware of it must succeed on a DC 19 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the dragon's Frightful Presence for the next 24 hours.
Poison Breath (Recharge 5–6). The dragon exhales poisonous gas in a 90--foot cone. Each creature in that area must make a DC 22 Constitution saving throw, taking 77 (22d6) poison damage on a failed save, or half as much damage on a successful one.
Festerwood Shift. Valdemar can teleport through the Festerwood up to 60ft.
Valdemar 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. Valdemar regains spent legendary actions at the start of its turn.
Frightening Gaze (Costs 2 Actions). Valdemar fixes its gaze on one creature it can see within 10 feet of it. The target must succeed on a DC 18 Wisdom saving throw against this magic or become frightened for 1 minute. The frightened target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a target's saving throw is successful or the effect ends for it, the target is immune to the lich's gaze for the next 24 hours.
Disrupt Life (Costs 3 Actions). Each non-undead creature within 20 feet of the Valdemar must make a DC 18 Constitution saving throw against this magic, taking 21 (6d6) necrotic damage on a failed save, or half as much damage on a successful one.
Description
Spending centuries trapped within the Festerwood has twisted Valdemar into something more undead and plant than dragon.
A green dragon skeleton held together with twisted roots and vines. A verdant green flame burns in his left eye socket and a glowing cracked glass orb emitting grey smoke sits in his right.
Lair and Lair Actions
Lair Actions
On initiative count 20 (losing initiative ties), the dragon takes a lair action to cause one of the following effects; the dragon can’t use the same effect two rounds in a row:
- Grasping roots and vines erupt in a 20-foot radius centered on a point on the ground that the dragon can see within 120 feet of it. That area becomes difficult terrain, and each creature there must succeed on a DC 15 Strength saving throw or be restrained by the roots and vines. A creature can be freed if it or another creature takes an action to make a DC 15 Strength check and succeeds. The roots and vines wilt away when the dragon uses this lair action again or when the dragon dies.
- A wall of tangled brush bristling with thorns springs into existence on a solid surface within 120 feet of the dragon. The wall is up to 60 feet long, 10 feet high, and 5 feet thick, and it blocks line of sight. When the wall appears, each creature in its area must make a DC 15 Dexterity saving throw. A creature that fails the save takes 18 (4d8) piercing damage and is pushed 5 feet out of the wall’s space, appearing on whichever side of the wall it wants. A creature can move through the wall, albeit slowly and painfully. For every 1 foot a creature travels through the wall, it must spend 4 feet of movement. Furthermore, a creature in the wall’s space must make a DC 15 Dexterity saving throw once each round it’s in contact with the wall, taking 18 (4d8) piercing damage on a failed save, or half as much damage on a successful one. Each 10-foot section of wall has AC 5, 15 hit points, vulnerability to fire damage, resistance to bludgeoning and piercing damage, and immunity to psychic damage. The wall sinks back into the ground when the dragon uses this lair action again or when the dragon dies.
- A cloud of swarming insects fills a 20-foot-radius sphere centered on a point Valdemar chooses within 120 feet of it. The cloud spreads around corners and remains until Valdemar dismisses it as an action, uses this lair action again, or dies. The cloud is lightly obscured. Any creature in the cloud when it appears must make on a DC 15 Constitution saving throw, taking 10 (3d6) piercing damage on a failed save, or half as much damage on a successful one. A creature that ends its turn in the cloud takes 10 (3d6) piercing damage.
Regional Effects
The region containing a legendary green dragon’s lair is warped by the dragon’s magic, which creates one or more of the following effects:
- Thickets form labyrinthine passages within 1 mile of the dragon’s lair. The thickets act as 10-foot-high, 10-foot-thick walls that block line of sight. Creatures can move through the thickets, with every 1 foot a creature moves costing it 4 feet of movement. A creature in the thickets must make a DC 15 Dexterity saving throw once each round it’s in contact with the thickets or take 3 (1d6) piercing damage from thorns.
Each 10-foot-cube of thickets has AC 5, 30 hit points, resistance to bludgeoning and piercing damage, vulnerability to fire damage, and immunity to psychic and thunder damage. - Within 1 mile of its lair, the dragon leaves no physical evidence of its passage unless it wishes to. Tracking it there is impossible except by magical means. In addition, it ignores movement impediments and damage from plants in this area that are neither magical nor creatures, including the thickets described above. The plants remove themselves from the dragon’s path.
- Rodents and birds within 1 mile of the dragon’s lair serve as the dragon’s eyes and ears. Deer and other large game are strangely absent, hinting at the presence of an unnaturally hungry predator.
If the dragon dies, the rodents and birds lose their supernatural link to it. The thickets remain, but within 1d10 days, they become mundane plants and normal difficult terrain, losing their thorns.
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