Duality is one of only four items to appear in both the Angel and Devil item pools, the others being 7 Seals, Lil Delirium, and Void.
The Duality image appears to be similar in concept to the yin and yang symbol of Ancient Chinese philosophy, as the latter represents the concept of dualism as well. However, they don't quite appear to be exact in terms of the diameter format.
In the optional chapters, Duality seems to only open one door.
This page was last edited on 14 April 2021, at 02:25.
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