Wen u get 2 d Tower and if u turned back, like looking opposite of were u where you can saw a big white ball. I think its like a reference to Teh Legent Of Link Major's Mask were d moon crashes on the Eart.
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It's a giant ball of crack cocaine, I know because the Grimoire told me that it arrived and it is what caused the collapse, not sure where the aliens are from though.