Legion

Legion, The Lord of all Shapeshifters, Body Snatchers, and the Incorporeal.

Legion, whose current body prefers to be called Shit-Load (because there is a shitload of me in here) is a greater demon and lord of the seven that is actually made up of a massive swarm of demonic entities that work in concert to spread their evil through the world. It appears as though the entity can be driven off with standard damage, though no weapon is known to effectively slay the Demon.
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Legion

The Good Guys 1976 Steeltemper