Shade
Monster Junkie
Sure, we can go with the rename to avoid confusion with the other poltergeists, and note the name change within.
We can modify this...
Lie in State (Su): If both of Adimarchus's forms die, Adimarchus (in his current form) disappears after 24 rounds. The body reappears dead but intact on Occipitus, his home layer of the Abyss. Any equipment Adimarchus was wearing or carrying at the moment of his death is likewise transported to Occipitus--and is likewise reconstituted if it was destroyed. Dimensional anchor, dimensional lock, and similar spells delay the body's transportation in this manner, but once the spell's effect ends, the body transports to Occipitus immediately. After lying in state for 100 days on his home plane, both of Adimarchus's forms are restored to full life. If Adimarchus is slain on his home plane, he is dead forever.
Poltergeists cannot be forever slain when encountered on the Prime Material plane; one whose body is killed will have its essence banished to Limbo or Gladsheim for a time and will then be able to reappear.
We can modify this...
Lie in State (Su): If both of Adimarchus's forms die, Adimarchus (in his current form) disappears after 24 rounds. The body reappears dead but intact on Occipitus, his home layer of the Abyss. Any equipment Adimarchus was wearing or carrying at the moment of his death is likewise transported to Occipitus--and is likewise reconstituted if it was destroyed. Dimensional anchor, dimensional lock, and similar spells delay the body's transportation in this manner, but once the spell's effect ends, the body transports to Occipitus immediately. After lying in state for 100 days on his home plane, both of Adimarchus's forms are restored to full life. If Adimarchus is slain on his home plane, he is dead forever.