Isekai Merge

After dying in an embarrassingly ordinary accident, you awaken in the fantasy kingdom of Veyrune with one bizarre gift: the power to merge objects together. Two of the same item become a stronger version. Two different items become something new. At first, it seems like a humble crafting skill, useful for fixing tools and improving weapons. Then you realize it can create artifacts, mutate monster loot, upgrade food, forge impossible gear, and completely ruin the local economy.