PC gets a sentient weapon

PC gets a sentient weapon
PC thinks it wields the weapon
Yet the weapon wields the PC

How do you actually pull this off?

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WHY would you pull it off?

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You don't

In order for this to work you'd need to take away control from the player over his character.

If the player is "good" at RPing he will let himself influence from the weapon though, so you just have your weapon whisper ideas to the guy and hope for the best.

You could "BioShock" it; the player was 'conditioned' to subconsciously do the work of the sentient weapon, meanwhile thinking every deed was his own decision.

Man, Stormbringer is such a fuck.

When all is said and done, it is literally the biggest fuck to ever have fucked.

...
Heeeaaadddsss...

In 2e there were rules for intelligent weapons that could communicate empathically or speak as with Magic Mouth spell. Lore had one such weapon as a mace made to destroy undead. This weapon, being drop forged and very magical, was nearly indestructible. So it had a very different perspective from its wielder and would always want to seek out and destroy the most powerful undead nearby. If the wielder didn't want to, the rules had this highly intelligent weapon make a roll to contest wills, and if it won the roll, it would force the player to do its bidding, as the Domination spell. When a very powerful undead was in range, the mace could fly at the undead and hit them to dispel them entirely. If the wielder held on, he would fly too, if he didn't, he would be out one very magical mace until he could get it back.

Daemon weaponry in 40k has been pretty fun for me to introduce to a party, historically

I mean, Black Crusade players are already pretty eager to backstab, but introduce a daemonic weapon into the fray and shit can get weird

I had a slaaneshii worshiper who fell madly in love with her bolter
Like, intimately so
it was, naturally, hilarious

The simplest route would be to have the weapon challenge the PC's will to perform tasks they would otherwise be against.

Beheading a defeated enemy, when the players would otherwise want to interrogate/reform/ransom/bring them back alive. That kind of thing.

Half the time they'll probably just pawn it off when it starts showing signs of being more than just a +1 longsword, though.