Creeper

Sneak : The creeper has advantage on stealth checks and will not make noise when moving

Explosive sensitivity: if  the creeper is grappled, incapacitated , paralyzed, restrained or prone by any means the creeper explodes

Explosion: The creeper will explode in a 7ft by 7ft area causing all creatures to make a dexterity saving throw of 16 or higher. On a failed save any creature within the 7ft by 7ft area takes 3d8 thunder damage and half as much on s successful save.

Warning hiss: the creeper makes a threatening hiss to signify that it will explode and makes an intimidation check with a plus 1. any creature that within a 5ft area of this hiss has to make a charisma saving throw or be stunned for 1 round