Arcanaloth's are the children of Sul Khatesh, the Keeper of Secrets. They are cunning, jackal-headed humanoids in their true form, but they are also accomplished shapeshifters and can take on any humanoid guise (including the appearance of a fox). Like the Keeper of Secrets, Arcanaloths hunger for knowledge and power, particularly knowledge relating to the use of magic.
Arcanaloths can speak, read and write all languages, aiding in their pursuit of knowledge but also making them well suited to act as negotiators and diplomats for the demons of the Demon Wastes and Khyber. Many of Hektula's agents are her Arcanaloth siblings, subtly manipulating the world's spellcasters into fulfilling her ends.