Thread:Lord Hyōga/@comment-25601601-20170627225651/@comment-4576906-20170820214720

That is a very good question, and honestly up to the speculation of the viewer. It has been said, at varying times, that a single shard of the Jewel can increase the power of a demon or human using it by a factor of 2, or even 100. The anime (and probably the manga, although I haven't read it) is pretty inconsistent on how it describes the extent to which a demon's powers are enhanced. It may just be purposefully exaggerated by rumors.