Description
This discourse on planar entities describes a ritual to summon a demon called Legul by placing Corrupted Skulls into the Brazier of Torment. It would be unwise to allow Jakub to ally with this being of evil.
Upon completion
I always presumed that the undead were mindless husks without the ability to reason or read. Obviously, Jakub still possesses an intellect capable of planning... and an appreciation of the knowledge held inside books.
This is progress!