Magic Resistance. The alxalatish has advantage on saving throws against spells and other magical effects.

Regeneration. The Alxalatish regains 10 hit points at the start of its turn. If the alxalatish takes radiant damage, this trait doesn't function at the start of the alxalatish's next turn. The alxalatish dies only if it starts its turn with 0 hit points and doesn't regenerate.

 Amphibious 

The alxalatish can breath both air and water.

Multiattack. The Axalatish makes two attacks with their bite.If shadow shock is available, they can also use it.

axe-gill. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) slashing damage.

Shadow shock(recharge 5-6)

The alxalatish  creates a burst of stunning shadows.All humanoids within 30ft of them must, make a dc 14 constitution saving throw.On a failure, they are stunned until the end of their next turn.