Demons and Druids (Daniel X Series #3)

Daniel X is on an impossible mission: to eliminate every intergalactic criminal. But with an explosive demon ready to destroy the Earth, he must travel back in time for his greatest challenge yet.
Using his incredible superpower to create objects out of thin air, Daniel X has taken on some of the most fearsome and fiendish aliens in the universe, and now he's aiming to extinguish his next target: the explosive demon of fir, Phosphorius Beta, and his army of flame-weaving henchmen.
But it'...