@Arantor said in You can make one object owned by your nemesis indestructable.: I vote their kidney, the one with the kidney stone in it. The lack of destructability implies the inability to remove them. Why not vote directly for "their oxalates" then? Ooh. Their adenosine. Or cortisol. Or serotonin. Or bradykinin. Any of those would produce a nice variation on Endless Waking Nightmare Life-In-Death. If you're having trouble choosing, pick bradykinin.