Before the beginning of the Players' turn, Borogeaa takes a lair action to cause one of the following effects; Borogeaa can’t use the same effect two rounds in a row:
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[ ] Floor of Ice. The icy floor of the chamber becomes slick and slippery, transforming into difficult terrain. A creature moving across the floor must succeed on a DC 13 DEX save or fall prone. The effect ends when Borogeaa takes her next Lair Action.
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[ ] Frozen Servants. 3 ice mephit minions coalesce out of the air. These remain until destroyed, but have a maximum number of 3 on the field at any one time.
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[ ] Ice Armor. Hoarfrost gathers on Borogeaa’s torso and limbs, solidifying into a suit of armor made of ice that grants her Medium Armor. The armor melts if Borogeaa takes more than 30 fire damage. Otherwise, it disappears when Borogeaa takes her next Lair Action.
- •Freezing Death.
(1 time use, recharge on Bloodied). With a touch, Borogeaa deals 4d8 cold damage plus 4d8 necrotic damage. If this damage would reduce the target to 0 hit points, the target drops to 1 hit point instead and has the petrified condition, turning into a frozen statue.
If the statue takes bludgeoning damage, it shatters, killing the frozen creature. If the statue would take fire damage, it instead takes no damage and thaws, ending the petrification.
- •Icy Axe.
Move up to 40 ft. Attack for 1d12+3 damage + 1d6 Cold damage.
- •Polar Ray.
Ranged attack within 120 ft. 3d10+5 cold damage.
At 97 HP, Borogea momentarily dissolves into a blizzard, magically teleporting to an unoccupied space it can see within 30 feet of herself. This does not provoke opportunity attacks. She then uses her Freezing Death ability.
At 0 HP Borogeaa is dying. If she takes 50 more damage she dies. Immediately after a creature Borogeaa completes a turn in which they damaged her, she momentarily dissolves into a blizzard, magically teleporting to an unoccupied space she can see within 30 feet of herself and makes a Icy Axe attack. This is in place of her normal action, not in addition to it, and the teleportation does not provoke opportunity attacks.