Subterfuge, breaking and entering, knowledge of what goes on in a private house, thievery and spying.
Sort of a demonic James Bond? Bellanger says that Sargatanas is great for the usual breaking-and-entering/spy stuff, and can teleport people as well. Theresa Bane adds mind-reading and brainwashing to that, but she tends to lean toward the vampiric side of any myth.
A solid character if you need a demon-worshipping cat burglar or investigator in your story. Artist/author Wayne Barlowe uses the name Sargatanas for the protagonist of his novel God’s Demon, a Grand Grimoire-influenced story set in his unique and horrible version of Hell.