Holoparasite
Holoparasite is a ghostrole, and a beast of a familiar, at the service of any Traitor at the cost of 14 TC from their uplink. They are incorporeal, unable to be hit by projectiles, and move at a much faster speed and do heavy amounts of brute damage, and are able to move even when their summoner is stunned, restrained, or crit.
However, they share damage with their summoner, and will disappear permanently upon death.
Fundamentals
When a holoparasite injector is used, a ghost role will open. Once you spawn as a holoparasite, your summoner will be notified with a silent message only visible to them, "Your guardian now has a soul."
From here, make sure to stay quiet! Only talk in a whisper, and only if you are 100% certain you are alone. Being heard or seen is a surefire way to get a KoS(kill-on-sight) order on your summoner.
Make sure to encourage or remind your summoner to clean and dispose of their holoparasite injector as well as the box it came in.