Innate Spellcasting. Cossaki's innate spellcasting ability is Wisdom (spell save DC 20). The oni can innately cast the following spells, requiring no material components:
At will: darkness, invisibility
3/day each: charm person, acid splash, gaseous form, sleep
1/day each: catnap, counterspell, protection from energy
Magic Weapons. Cossaki's weapon attacks are magical.
Regeneration. Cassaki regains 10 hit points at the start of its turn if it has at least 1 hit point.
Multiattack. Cossack makes two attacks, one with its bite and 1 with its coils in its serpent form, or 2 with its glaive.
Bite (Serpent Form Only). Melee Weapon Attack: +10 to hit, reach 15 ft., one target. Hit: 28 (4d8 + 10) piercing damage.
Coils (Serpent Form Only). Melee Weapon Attack: +10 to hit, reach 20 ft., two target. Hit: 35 (6d10 + 3) bludgeoning damage, and 9 (1d10 + 4) acid damage. Any creature struck by this attack is also grappled.
Glaive (Humanoid Form Only). Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 18 (2d8 + 8) slashing damage. The target must roll a DC 15 CON save to avoid taking 2d8 poison damage and be poisoned. 1/2 damage and not poisoned on a successful save.
Change Shape. Cassaki magically polymorphs into a Large Snakeman humanoid, or back into its true form. Other than its size, its statistics are the same in each form. The only equipment that is transformed is its glaive, which shrinks so that it can be wielded in humanoid form. If Cossack dies, it reverts to its true form, and its glaive reverts to its normal size.
Into the Void. As a Bonus Action, Cassaki can pull any creature grappled by its coil attack 30' closer to the void (or in any direction) and be released. If the creature is small, it cannot be seen by anyone, and is currently blinded. Cossack can also increase the power its Grapple to cause the Restrained condition.
Say Ahhh!. As a reaction to being hit by a critical attack, Cossaki can release an acid spray from the wound in a 15' cone. Each creature in that cone must make a DC 18 DEX save or suffer 4d8 Acid Damage, 1/2 on a successful save. On a failed save, the target will suffer 2d8 Acid damage until an Action is spent to remove the acid.
Tail Trip. Caasaki can whip its tail out 10'. Any target in that space must make a DC 16 STR save or be knocked prone.
Tail Transport. Cossack can lift any of its allies with its tail 15' in any direction.
Cassaki can make a Perception Check to survey her surroundings.
Description
Cossaki is the Nature Spirit of the Ama Basin that has been banished from its own Temple due to Wei-Chin dominance of the Swamp. Its power to Polymorph / Shapeshift into its Human form has been lost. Only the destruction of Wi-Chin stasis chamber can return this ability. Cossaki's lair guards a teleportation Circle created by Agrias to the Scar Temple in Calimport.
Lair and Lair Actions
Tail smash. Cossaki can lash its tail out to hit the ceiling of the its lair. Any creature within 15' of the space where its tail is located must make a DC 13 DEX save or take 3d8 bludgeoning damage and be knocked prone. 1/2 damage if successful.
Snake Summon. Cossaki can summon 1d6 Giant Constrictor Snakes.
Void Trance. The enemy closest to the void must make a DC 15 WIS save or use its reaction to take its full movement to jump into the void.
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