Stun Grenade

Stun Grenade is a grenade-type skill which stuns nearby enemies on detonation.

Details

 * Effects:
 * Throws an arcing projectile which explodes on contact with an enemy or a horizontal surface
 * The projectile bounces off of Shield Bearer shields without detonating
 * Upon explosion, deals damage and inflicts a 2-second stun on enemies in close proximity
 * Tags: Ranged, Explosive, Negligible Damage, Stun
 * Legendary Version: Unconsciousness
 * Forced Affix: Long Stun
 * "+50% stun effect duration"

Blueprint location
The blueprint for Stun Grenade is located in the Ramparts, in a secret area in the very last, far-right tower. The tower itself doesn't always spawn, so it may require a few runs to get it, but if it does, it will always be the last tower.