[a humble lich]

I had a character with it once, where it was a disadvantage I gained from to many failed fright checks. As it was one of several disadvantages that character had which were gained that way I found it difficult to play. I eventually bought it off for the same reason several people here have mentioned: it was pretty crippling to play. I like the concept, it was just difficult to have in practice.

The moral: avoid contact nameless horrors that man was not meant to know if you don't want difficult mental disadvantages. And definitely avoid sacrificing your soul to them for the good of the party.