Sanity. Wisdom 14 (1d6)

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

Furtive. The zergling has advantage on hide checks.

Agile. The zergling can make the Dash, Disengage, Bite or Hide action as a bonus action on each of its turns.

Sneak Attack. Once per turn, the zergling can deal an extra 3d6 damage to one creature if it have advantage on the Attack roll or it has an ally within 5 feet of its target.

Hook. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit:  7 (1d6 + 4) slashing damage. 

Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit:  3 (1d6) piercing damage. 

Block. Gain +5CA for the round (3/Day).

Dodge. Reduce the damage taken to 1/2.