Blight Lich Magus

Medium undead, neutral evil

Armor Class 17 (natural armor)
Hit Points 153 (18d8 + 72)
Speed 30 ft.

STR	DEX	CON	INT	WIS	CHA
11 (+0)	15 (+2)	18 (+4)	18 (+4)	20 (+5)	19 (+4)

Saving Throws Con +10, Int +10, Wis +11
Skills Nature +10, Perception +11, Survival +11
Damage Resistances cold, lightning, necrotic
Damage Immunities poison; bludgeoning, piercing, and slashing from nonmagical weapons
Condition Immunities charmed, exhaustion, frightened, paralyzed, poisoned
Senses truesight 120 ft., passive Perception 21
Languages Common, Druidic, Sylvan, plus up to three other languages
Challenge 20 (25,000 XP)

Special Traits

• Circle of Rot. Whenever an undead creature is destroyed within 60 feet of the magus, the magus regains a number of hit points equal to twice the destroyed creature’s CR.
• Legendary Resistance (3/Day). If the magus fails a saving throw, it can choose to succeed instead.
• Rejuvenation. If it has a phylactery, the destroyed magus gains a new body in 1d10 days, regaining all its hit points and becoming active again. The new body appears within 5 feet of the phylactery.
• Spellcasting. The magus is an 18th level spellcaster. Its spellcasting ability is Wisdom (spell save DC 19, +11 to hit with spell attacks). The magus has the following druid spells prepared:
• Cantrips (at will): guidance, poison spray, thorn whip
• 1st level (4 slots): detect magic, fog cloud, thunderwave
• 2nd level (3 slots): gust of wind, hold person, moonbeam
• 3rd level (3 slots): dispel magic, protection from energy, sleet storm
• 4th level (3 slots): blight, confusion, polymorph
• 5th level (3 slots): antilife shell, contagion, insect plague
• 6th level (1 slot): move earth, wind walk
• 7th level (1 slot): plane shift, reverse gravity
• 8th level (1 slot): earthquake, feeblemind
• 9th level (1 slot): shapechange, storm of vengeance
• Turn Resistance. The magus has advantage on saving throws against any effect that turns undead.

Actions

• Decomposing Touch. Melee Spell Attack: +11 to hit, reach 5 ft., one creature. Hit: 21 (6d6) necrotic damage, and the target must succeed on a DC 19 Constitution saving throw, or become poisoned for 1 minute. While poisoned, a creature must succeed on a DC 19 Constitution saving throw at the start of each of its turns, or take 21 (6d6) necrotic damage. Once a creature succeeds on the saving throw, the effect ends for it.
• Undead Beast Shape (3/Day). The magus magically polymorphs into a beast with a challenge rating of 10 or less, and can remain in this form for up to 9 hours. While in this form, the magus resembles a decomposing, undead version of that beast. The magus can choose whether its equipment falls to the ground, melds with its new form, or is worn by the new form. The magus reverts to its true form if it dies or falls unconscious. The magus can revert to its true form using a bonus action on its turn. While in a new form, the magus retains its game statistics and ability to speak, but its AC, movement modes, Strength, and Dexterity are replaced by those of the new form. Additionally, it gains the special senses, proficiencies, traits, actions, and reactions (except class features, legendary actions, and lair actions) of its new form. The magus can’t cast spells with somatic components in its new form. The new form’s attacks count as magical for the purpose of overcoming resistances and immunity to nonmagical attacks. Additionally, when the magus hits with a weapon attack in its new form, the target takes an additional 21 (6d6) necrotic damage and must succeed on a DC 19 Constitution saving throw, or become poisoned for 1 minute. While poisoned, a creature must succeed on a DC 19 Constitution saving throw at the start of each of its turns, or take 21 (6d6) necrotic damage. Once a creature succeeds on the saving throw, the effect ends for it.

Legendary Actions

The magus 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 magus regains spent legendary actions at the start of its turn.

• Cantrip. The magus casts a cantrip.
• Decomposing Touch (Costs 2 Actions). The magus uses its Decomposing Touch.
• Shapechange (Costs 2 Actions). The magus uses its Undead Beast Shape.
• Rot Absorption (Costs 3 Actions). The magus draws life energy from creatures around it, that aren’t undead or constructs, causing the victims’ flesh to wither. Creatures within 30 feet of the magus must succeed on a DC 19 Constitution saving throw, or take 14 (4d6) necrotic damage. The magus regains a number of hit points equal to half the total damage dealt.