Minecraft wiki entry for Island_survival, associated text: Wandering trader spawn on the same island you are on (typically in the water). In island survival, however, because you likely have no emeralds, you can kill the trader for its leads and its llamas. If you have found emeralds from shipwrecks or treasure chests, ruins, or mineshaft chests, you can purchase some useful things from the wandering trader. There is no penalty for killing one, and another eventually appears afterward.