Datsusara Souryo no Dungeon Sousou Haishin

Daishi quit his office job and started live-streaming dungeon exploration. His suitable job is "Priest," which you'd expect to be a healing class, but the skill he learned is "Cremation," which burns enemies to ashes!? "There's no way a priest like that exists!"

https://comic-walker.com/detail/KC_008452_S