Stun is a result of being hit by certain abilities. Stun prevents you from using abilities or the shield until the stun wears off. While stunned, stars will circle your Aniphon's head and all its abilities will be blocked. Shielding can block moves from stunning your Aniphon. Stun usually last from 7-12 seconds before it wears off. The ability cooldown continues to run while you are stunned.