Removing slimes and construct out of certain levels like Jigsaw Valley or Scarlet Fortress where they don't make too much sense to be there would honestly help make piercing really useful, because piercing doesn't seem like too good of a choice. The only level I really know what I'm dealing with is Gloaming Wildwoods, because it's PACKED with beasts, and very little construct. No slime except for out of boxes.
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