Aphid

Duplication Glitch. Aphid's can clone them self over the course of three uninterrupted long rests. This action continuous even if the aphid is transformed in to a new creature in which the clone comes out as that new creature with, with all  the creatures new abilities. 

Sting. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 4 (1d4 + 2) piercing damage, and the target must succeed on a DC 11 Constitution saving throw or become poisoned for 1 hour. If the saving throw fails by 5 or more, the target falls unconscious for the same duration, or until it takes damage or another creature uses an action to shake it awake.

The size of the Aphides makes all movement of Large and bigger creatures seem to move in slow motion. 

Insect Time (Always active) All large or bigger creatures within 100ft of the Aphid lose one half of their movement speed.