June is right.
Battle on the Treetops is a repeatable quest - you can kill Cladt again if you didn't get lucky with what he dropped, however if you killed him, he'll take a while to respawn.
Simply talk to Akia to get back to the village. Note that you can also type /reset to soft-reset any dungeons you're in. Normally, bosses remain defeated until the dungeon hard-resets, but in this case, Cladt counts as a quest monster, and will respawn.
