Voadam
Legend
I used an aboleth mage/loremaster in my high level game. It was the prisoner of a rakshasa sorcerer the party had killed and was investigating. He kept the aboleth in his basement (along with others in different rooms) chained and hooded. He had it do legend lore once a week for him to provide info on those he dealt with. He also had it covered by an illusion so it appeared as a chained and blindfolded scantily clad beautiful woman held neck deep floating in a glass pool. The truesight ability of the party paladin's artefact sword served him well there, otherwise he would have went to rescue the bound prisoner and things would have turned uglier. instead they left her but found the illusion covered interrogation journals and the loremaster's crystal spellbook that worked by creating disturbing images in the mind of those who touched it.