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"The Mask of Fusion is a Kanohi that allows its user to forcibly merge themselves with one or more beings into a single larger being. The mask-user will maintain most of the mental control over the fused being. Strong minds can resist the merging, and even a weak mind can interfere with the user's control. The Kanohi can also be used to keep natural fusions stable in presence of powers that disrupt them.
If a Mask of Fusion were to be destroyed while two beings are still merged from the power of the mask, the fusion would split up." -Biosector01
This is based off of its depiction in the Bionicle comics.