I gifted my party a sapient dagger. It was really good too. It was a 1d6 but let you attack again, but rolling a 5 or less on the die makes you insane because the dagger insults the user so badly for missing. If it happened 12 times, the character died. They used it from level 3 or 4 through the end of the campaign at level 18, since there was no cap on how often you could attack again.