Board Thread:General Discussion/@comment-24712247-20141009135553/@comment-24821572-20141009142618

The farming method on Key Molds page works tremendously, unless you feel that AFK farming is cheating. You just need a few traps to get going. For me, the frozen key mold is the easiest to obtain, and subsequently, the most useless.

If you want an acceptable farm, create an artificial snow biome in the middle of the map, and summon pirates/invasions or if it takes your fancy, Pumpkin Moon/Frost Moon. With sufficient kills, you are almost guaranteed a key mold per summon.