I am trying to farm both Ectoplasm and Frozen Key Mold in Terraria.
If I place more than 300 blocks of ice/snow in the dungeon so that the background turn into ice, will killing dungeon mobs give me the Frozen Key Mold?
Terraria – Snow Biome in Dungeon
terraria
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Best Answer
If the wording on the Biome Key Mold wiki page is accurate, I believe the answer to your question is yes. From said page (emphasis is mine):
Creating an artificial snow biome should eventually yield a frozen key mold, assuming that your character remains within that biome. You'd need to make the biome big enough to ensure that you don't accidentally exit it and enter back into the natural dungeon.