Acidic Blood. Each creature that deals slashing or piercing damage to the Yitsan while within 5 ft of it takes 5(1d10) acid damage.

Amphibious. The Yitsan can breathe air and water.

Reactive. The Yitsan can take three reactions in each round of combat. All reactions return on the Yitsan's turn.

Spider Climb. The Yitsan can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Multiattack. The Yitsan makes two attacks: one with its bite and one with its claws. Alternatively it makes four claw attacks against a prone creature.

Bite. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 15 (2d10 + 4) piercing damage plus 4 (1d8) acid damage.

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

Tail. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 11 (2d6 + 4) slashing damage, and the target must make a DC 15 Strength saving throw or be knocked prone.

Tail Sweep. If a creature moves more than 5 ft while within 10 ft. of the Yitsan, the Yitsan can make a tail attack against that creature.