Kapitel 488: Changes in the situation 

Aster approached the black altar which the evil spirit created using a huge yin accumulation crystal and he casually grabbed it with his bare right hand and lifted it, as if the yin it was radiating wouldn't normally corrode the hand of any male cultivator below the Void Manipulation realm.

Aster didn't even need to use yang radiance, his yang overflowed through all his body naturally, so he didn't need to use it for himself, that's in part why others tend to confuse him as a dual cultivator, the women who enter in contact with him on a daily basis, have traces of his yang on them, regardless of the nature of their relationship, of course some are obviously more affected by it.

Anyway, Aster sent the yin accumulation crystal to the mind space, since keeping it in a spatial ring, might deteriorate the ring due to the corroding effect, as it hasn't been refined yet.