@Pure Adamatium Nugget: Here's my version. I'm a bit worried about power if a scum gets it, but then again they'll dump it soon after acquiring it or risk dying.
Makes you kill immune and your kills bypass resistance and protections. After the second night you own this artifact, a random player with your alignment gets killed each night. This kill bypasses resistance but can be protected against. (This kill is very specific: Foo, killed by demons.)
Grayswandir: Grants you a double kill. (Grayswandir deals double damage to everything. That's not even getting into silver damage, which is likely to double your damage over, or the fact most people using Grayswandir duel-wield it with another silver saber, effectively doubling damage over again.)
Just a quick note, in Crawl there's a regular brand for cloaks called "of darkness". In Crawl you can activate it to become invisible temporarily, but it fails a lot and gives you magic contamination which causes glowing. So I'd make it an (x) activatable that gives you a 50% chance of being untargetable and lynch resistant for night/day you activate it on, but the next night and day you glow, making you targetable and lynchable if you would otherwise be untargetable or unlynchable for whatever reason. If the items fails, you don't glow. That seems alright in power for a rare, although maybe it should be a touch weaker. The chance for success could be lower, for instance. I'd also like to simplify since even for a rare this is pretty complex, but I can't think of any way to do that. So it might be best to just not add this at all. It's borderline unfun for a lot of reasons, not the least of which is that nobody likes random chance all that much. It's also not fun to learn that your opponent "got lucky" to avoid the kill or lynch. So I dunno, I need another opinion on this. There's also the existing "cloak of shadows" that would have to be dealt with since they've got similar names. Is it even worth it?
I've got the perfect rename for "wand of jailing". Call it "Wand of Door Creation", a wand from IVAN. Does what it says on the tin, surrounds what you zap with doors. Mithril doors. Many of them locked. I think that qualifies as rolebock and protection, yes?
Do you guys think we should start a quicktopic or something to discuss this on so other games and whatnot can have some facetime as well? I love suggesting new items but there's a point where it gets too much.
Whoever's taking care of the Google doc (Toaster?), it might be cool if everything on there also listed the source of the item somewhere to help identify which items could do with renames. I'm a bit of a stickler that everything actually come from somewhere. Does anybody else care? I doubt it, but I'd gladly do a lot of the legwork here if you want. We might learn if we're leaning too heavily on one roguelike or whatever and not representing another very much. I don't think Angband is represented at all, for instance. I'd specifically like to see some more D&D stuff in there besides one artifact, although with my luck a bunch of stuff in there is from D&D since I wouldn't know one way or the other.