Zikzokrishka

Huge Undead, Lawful Evil

AC: 19

Initiative: +0 (10)

HP: 225 (18d12 + 108)

Speed: 40 ft., burrow 30 ft., fly 80 ft.

STR: 25 (+7)
DEX: 10 (+0)
CON: 23 (+6)
INT: 16 (+3)
WIS: 15 (+2)
CHA: 19 (+4)

Saving Throws: Dex +6, Con +12, Wis +8, Cha +10

Skills: Perception +14, Stealth +6

Resistances: necrotic

Immunities: lightning; poison

Condition Immunities: charmed; exhaustion; frightened; paralyzed; poisoned

Senses: blindsight 60 ft., darkvision 120 ft., Passive Perception 24

Languages: Common, Draconic

CR: 17 (XP 18,000; PB +6)

Legendary Resistance (3/Day).

If Zikzokrishka fails a saving throw, it can choose to succeed instead.

Magic Resistance.

Zikzokrishka has advantage on saving throws against spells and other magical effects.

Actions

Multiattack.

Zikzokrishka can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.

Bite.

Melee Weapon Attack: +13 to hit, reach 10 ft., one target. Hit: 18 (2d10 + 7) piercing damage plus 5 (1d10) lightning damage.

Claw.

Melee Weapon Attack: +13 to hit, reach 5 ft., one target. Hit: 14 (2d6 + 7) slashing damage.

Tail.

Melee Weapon Attack: +13 to hit, reach 15 ft., one target. Hit: 16 (2d8 + 7) bludgeoning damage.

Frightful Presence.

Each creature of Zikzokrishka's choice that is within 120 feet of the Zikzokrishka and aware of it must succeed on a DC 18 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 Zikzokrishka's Frightful Presence for the next 24 hours.

Lightning Breath (Recharge 5-6).

Zikzokrishka exhales lightning in a 90-foot line that is 5 feet wide. Each creature in that line must make a DC 20 Dexterity saving throw, taking 66 (12d10) lightning damage on a failed save, or half as much damage on a successful one.

Legendary Actions

Legendary Action Uses: 3. Immediately after another creature’s turn, this creature can expend a use to take one of the following actions; it regains all expended uses at the start of each of its turns.

Detect.

Zikzokrishka makes a Wisdom (Perception) check.

Tail Attack.

Zikzokrishka makes a tail attack.

Wing Attack (Costs 2 Actions).

Zikzokrishka beats its tattered wings. Each creature within 10 feet of Zikzokrishka must succeed on a DC 21 Dexterity saving throw or take 14 (2d6 + 7) bludgeoning damage and be knocked prone. After beating its wings this way, Zikzokrishka can fly up to half its flying speed.

Lair Actions

On initiative count 20 (losing initiative ties) whenever she is in the are V3, Zikzokrishka can take a lair action to cause one of the following effects. She can't use the same effect two rounds in a row:

Part of the ceiling collapses above one creature that Zikzokrishka can see. The creature must succeed on a DC 15 Dexterity saving throw or take 21 (6d6) bludgeoning damage and be knocked prone and buried under rubble. A buried creature is restrained and unable to stand up. A creature can use an action to try to pull itself or another creature out of the rubble, doing so with a successful DC 10 Strength (Athletics) check.
A cloud of sand swirls in a 20-foot-radius sphere centered on a point Zikzokrishka can see within 60 feet of it. The cloud spreads around corners. Each creature in the cloud must succeed on a DC 15 Constitution saving throw or be blinded 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.
Zikzokrishka chooses two points that it can see, each of which must be on a solid surface, and creates a 5-foot-wide line of lightning between them. The two points must be within 60 feet of Zikzokrishka and 60 feet of each other. Each creature in the line must succeed on a DC 15 Dexterity saving throw or take 10 (3d6) lightning damage.

Find this creature in the encounter builder

Source: Candlekeep Mysteries, p. 209 - Licenses and attribution