Interesting. So it seems my circumstance isn't exclusive to the regular cavern layer mobs ability to spawn. It will work with whatever alternate biome you choose. So long as mobs from a different biome other than hallowed also have the possibility to spawn, chaos elementals will spawn offscreen. Just construct your farm in a way that hallowed mobs will spawn offscreen, but make sure than not ONLY hallowed mobs can spawn.
Because spawning seems kinda strange right now with mobs being able to spawn within the minimum distance from the player, I'd make a platform out of blocks from whatever other biome besides hallowed you prefer, then clear out flat space on the sides made of pearlstone. This will let mobs from the biome blocks you're standing on spawn, but also allow hallowed mobs to spawn on the offscreen flat surfaces on the sides.
You will get chaos elementals.
You can pick whatever biome you want to depending on what else you're after (key molds come to mind). Just remember that hallowed key molds are exclusive to crimson and corruption.
Example, make a platform out of lizahrd bricks, flatten out the sides that extend offscreen and make them out of pearlstone, put a large square of ice blocks above you, place a water candle on a table where you're stading and chug a battle potion. You can farm Rod of Discord, Rainbow Rod, Soul of Light, Frost Key Mold, Hallowed Key Mold, and Jungle Key Mold at the same time. Once you have the hallowed drops you want, replace the pearlstone with red and purple ice. Then you can farm soul of light, soul of night, ichor, crimson key mold, corruption key mold, frost key mold, and jungle key mold at the same time.
Because spawning seems kinda strange right now with mobs being able to spawn within the minimum distance from the player, I'd make a platform out of blocks from whatever other biome besides hallowed you prefer, then clear out flat space on the sides made of pearlstone. This will let mobs from the biome blocks you're standing on spawn, but also allow hallowed mobs to spawn on the offscreen flat surfaces on the sides.
You will get chaos elementals.
You can pick whatever biome you want to depending on what else you're after (key molds come to mind). Just remember that hallowed key molds are exclusive to crimson and corruption.
Example, make a platform out of lizahrd bricks, flatten out the sides that extend offscreen and make them out of pearlstone, put a large square of ice blocks above you, place a water candle on a table where you're stading and chug a battle potion. You can farm Rod of Discord, Rainbow Rod, Soul of Light, Frost Key Mold, Hallowed Key Mold, and Jungle Key Mold at the same time. Once you have the hallowed drops you want, replace the pearlstone with red and purple ice. Then you can farm soul of light, soul of night, ichor, crimson key mold, corruption key mold, frost key mold, and jungle key mold at the same time.
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