Grinner originally a dentist before he met his untimely demise joining the undead horde forever hoping that one day he will find the perfect angle for that wonderful smile to shine. Grinner is a Force affinity rare from the Undead Hordes faction.
He is best known for his value in Faction Wars, especially if you do not yet have the other strong epic reviver in this faction – Gorgorab. Undead Hordes have a very strong Faction and therefore he may not be required, however his revive does give him a lot of viability to help you 3 star levels. He really does not need to be 6 stars to do his job, just build him fast and tanky.