Parece O Assistente de Oathbound :
Matt Mantrell 20s is Lord High Wizard in world where poems are spells, and oaths unbreakable. After 3 years wait to marry love Queen Alisande, he angrily swears to take Ibile from evil Gordorgrosso. New pals - surly dracogriff Narlh, courtly cyclops Fadecourt, damsel Yverne, well-wist spirits, wee Puck, Robin Hood - join old - Sir Guy, dragon Stegoman, demon Max.
E um quote (ênfase minha):
Narlh frowned at him. "Who's Max?"
"Maxwell's Demon! The one I told you about, the Spirit of Entropy! He controls the organization of matter and energy!"