Intelligent weapon vs protection from X: how would you handle

[Foxdie13]

Reason why its here and not rules section is thats rules are clear and no mistakes there: dm fiat is written blac and white there.

My group killed a bad guy with a chaotic intelligent weapon. Weapon powerful yes (+5 equivalent for a lvl 11 pc) but its pretty clear its not the kind of weapon they want to use. They did the spellcraft check over 1 month in game time and they got all the info, including the weapon goal: chaos above everything else.

I was not expecting a player to keep the weapon considering they knew the dc to resist the ego. The player even refused to get items to improve will save. Yes i can be blamed but it was a trap and they jumped in

Other players want to use protection from chaos to free the players and get rid of the weapon.

Now here is the thing: prot from chaos protect from mind control and CAN protect from similar effect . Now considering keeping the weapon will eventually (very soon) cause the downfall of the player (weapon want the king with another one, for the lolz) and the player fell the ego challenge final question is

Should i let prot from chaos work or let the trap go full speed ahead?

[Lincoln Hills]

I believe the spell will work to shield the wielder. But the item is liable to take that sort of thing personally, and the next time anybody picks up that weapon without being properly 'shielded' there'll be an immediate Ego check and a demand to "behead any member of this party capable of casting the spell that locked me out last time." Depending on its personality, the item may also simply 'switch off' any powers that require its cooperation. To say nothing of simple, dirty tricks such as shouting helpful advice to enemies.

In short - play your cards right and the party may yet change their minds about keeping the item. They thought they could get the honey without risking the sting.

[Claxon]

I'm might be inclinded to let Protection from Chaos prevent the mind control, but the weapon would refuse to use any special abilities and would immeadiately try to dominate anyone else that came into contact with it. And I agree that it would also try to kill all the party member who cast the spell and in general be completely uncoopperative.