Ythanel: A minister of the infernal king Jamaz, who reigns over the element of fire. According to Driscoll’s edition of the Sworn Book, Ythanel is a hot and hasty demon with a complexion like living flame. In addition, he is energetic, strong, and disposed to act generously toward others. He can reverse or prevent decay, and he can cause death at will. He is reputed to be able to raise an army of one thousand soldiers. He also provides familiars.
All of these spirits have the appearance of soldiers as well.

Source : The Dictionary of Demons written by Michelle Belanger.