Atropal, Greater

Regeneration. The atropal regains 10 hit points at the start of each of its turns, so long as it has 1 hit point.

Divine Resistance. Whenever the atropal fails a saving throw, it can choose to succeed instead. Whenever the atropal succeeds on a saving throw in this manner, it regains two less legendary actions at the start of its next turn.

Titan. As a titan, the atropal's attacks are considered magical, it has advantage on saving throws against spells and other magical effects, it cannot have it's form changed against its will, and it cannot be targeted by divination magic or be perceived through scrying sensors.

Negative Energy Aura. Creatures within 30 feet of the atropal can't regain hit points, and any creature that starts its turn within 30 feet of the atropal takes 18 (4d8) necrotic damage. If the atropal is struck by a vorpal sword, the wielder can cut the atropal's umbilical cord instead of dealing damage. If its umbilical cord is cut, the atropal loses this feature. Additionally, all undead allies of the atropal that start their turn within the affected area are immune to the effects of Turn Undead and similar effects.

Multiattack. The atropal makes three attacks: one with its Touch of the Grave, one with its Cold Ray, and one with its Life Drain. The atropal can replace one of these attacks with a use of Spellcasting.

Touch of the Grave. Melee Spell Attack: +19 to hit, reach 10 ft., one target. Hit: 62 (8d12 + 10) necrotic damage. If the target is a living creature, it must make a DC 27 Constitution saving throw or have its Constitution score is reduced by 1d4. If a creatures Constitution score is reduced to 0, it dies.

Life Drain. Melee or Ranged Spell Attack: +19 to hit, reach 10 ft. or range 60 ft., one target. Hit: The target loses 43 (6d10 + 10) hit points, and the atropal regains a number of hit point equal to half of what the target lost.

Cold Ray. Ranged Spell Attack: +19 to hit, range 120 ft., one target. Hit: 37 (6d8 + 10) cold damage. If the target is a creature, its speed is reduced to 0 until the end of the atropal's next turn.

Spellcasting. The atropal casts one of the following spells without providing material components, using Charisma as the spellcasting ability (save DC 27, +19 to hit with spell attacks):
At will: animate dead (as an action), create undead (as an action), cone of cold, dispel magic, finger of death, plane shift, speak with dead, teleport
5/day each: haste, project image, weird

Summon Nightshade (Recharge 5-6). The atropal summons a nightwalker into an unoccupied space it can see within 300 feet of it. A nightwalker summoned in this manner acts in initiative immediately after the atropal, The atropal can take this action 5 times per Long Rest.

The atropal can take 3 legendary actions, choosing from the options below. Only one legendary action can be used at a time and only at the end of another creature's turn. The atropal regains spent legendary actions at the start of its turn.

Strike. The atropal makes a Ray of Cold attack.

Undying Will (Costs 2 Actions). The atropal makes a Life Drain attack, or uses Spellcasting.

Summon Nightwalker (Costs 3 Actions). The atropal recharges, or uses its Summon Nightshade action.