Shaper of Isles

Arlen arrives in a chain of tropical islands beneath an alien moon. It's far from an idyllic vacation for this Earthman, but he finds he has much to teach and much to learn from this primitive but magic-using society. What can he discover from the elemental spirits and the ancient Builders' ruins, and will he always be an outsider pushing the islanders to change?

Features isekai, wizardry, war, monsters (some of them edible), and colonization good and bad.

(Cover art by Ede Laszlo, done for "Worlds Without Number" and freely licensed. Looking for a replacement!)