There's only two things in this room that could reasonably be brain-visible obstacles.
×Well, the mud's pretty thin... the only place you can stand that's surrounded by mud is the mud mother's square itself. Then force arrows would also serve as obstacles.
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×So you better do all your growing and reshaping before you kill that mother.
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×Trim the mud to just the corners, without prematurely creating open space that can't be grown past.
