Edwin, the Sentient Dagger of Pain

Edwin looks to be a rather long dagger, with a slightly curved tip. The magic dagger is sentient, and identifies as a male named Edwin. He doesn't remember anything about his "life" prior to his previous owner, a Qudran slave master named Fikel, who used him to torture both slaves and prisoners of foreign wars, taken in to become slaves.
Edwin is sullen and opinionated, but loyal to any master who does not use him for his "intended purpose" of torture. His only goals in life are to unlock the hidden memories of his past, and to find his old master and bring the slaver to justice. He assumes he is the disembodied soul of a fallen knight, forced to live on for eternity within the blade of his enemy (one possibly unjustly slain), but is this simply a flight of fancy or actually the truth?

Mechanics & Inner Workings

The following are Edwin's statistics:
Edwin is a +1 dagger, but on successful hit (plus key word "Pain!" uttered by its possessor prior to rolling) the target must make a (DC15) Charisma Save or will feel as if the wound is worse than it actually is. After which, all rolls (attack or skill checks) the target makes are at disadvantage (except any Save to end "pain" effect) each round until successful charisma save (also DC 15) is made.
1 save attempt per round. Edwin's Pain effect has 6 charges per long rest.
Edwin is LN, with a 9 INT, and requires attunement, after which Edwin will often offer (bad, INT 9) advice and greatly resents any request to shut up.

Rarity

Unique

Weight

2lbs