Nova, one of the playable characters in HotS, is a stealth assassin with a basic ability called "Holo decoy". The Decoy functions as a copy of Nova, mimicking her actions, but has a distinct AI which forces players to "act like the AI" to blend in. The Decoy can do damage, absorb damage, and effectively trick the team into believing that it is Nova. It will disappear after a few seconds if it's not killed before the timer runs out. Enemies will see the Decoy "as Nova", but teammates of Nova will see it as a blue-ish version of her. Previous version of the game spawned several Decoys, but currently (Apr 2021) there's only one.