Multiattack. The Zhu makes one short sword attack and uses either its Psychic Worm attack or its tail spike.

Short Sword. Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 6 (1d6 +3) slashing damage.

Psychic Worm. Ranged Spell Attack: +3 to hit, range 60 ft., one creature. Hit: 10 (3d6 +1) psychic damage. On a hit the target must make an Intelligence saving throw (DC 11). If the target fails the save, they have disadvantage on all Constitution saves for 1 minute.

Tail Spike. Melee Weapon Attack: +4 to hit, reach 10 ft., one creature. Hit: 4 (1d4 +2) piercing damage and 6 (3d4) poison damage. On a hit the target must make a Constitution save or be infected with the Zhu disease. An infected creature must make a Constitution check (DC 13) at the end of each long rest until cured. The creature recovers if they make three successful Constitution checks before they fail three checks. If the creature fails three Constitution saves, they are transformed into a Zhu.