Innate Spellcasting. Bathyraja's innate spellcasting ability is Charisma (spell save DC 16, +9 to hit with spell attacks). She can innately cast the following spells, requiring no material components:
At will: detect evil and good, detect magic
3/day each: control water, tongues, speak with animals
1/day each: conjure elemental (water elemental only), gaseous form, invisibility.
Multiattack. Bathyraja can make two attacks.
Blade of Yersey. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 5) slashing damage.
Whirlpool (recharge 5-6). Water swirls around Bathyraja. Each creature within 20ft. must make a DC 17 Dexterity saving throw. On failure, targets take 21 (6d6) cold damage and are knocked prone. On success, targets take half damage and are not knocked prone.