The Riven Shield by William Myrl

Mythopoeia rests in the boughs of a great ash tree that roots in darkness. Timothean was once a sorcerer, but gave up his humanity in a war against the gods in eons past. For thousands of years there has been order, a peace maintained by the magical artifice of long dead wizards. When Timothean decides to break that order, he must begin by shattering the defenses he helped put in place long agoThis is a tale of a world in the breaking. Only an immortal barbarian, a lizard raised as a wizard, and a few young not quite heroes can come to stand between it and the end of all things.