I have the True Name of a Pit Fiend
RotL, playing a thassilonian specialist transmuter wizard. We got a profane gift a while a go for cool plot reasons (+6 to a stat, +4 to another one).
Now we freed a Pit Fiend from a magic circle, and I forced him to give me his true name in exchange for his freedom.
What can I do with it? Wish 1/year (which equals to a Wish 1/campaign) is nice, but maybe becoming a devil bound creature is better.
Suggestions?