Talk:Tamamo no Mae/@comment-4802891-20180117071534/@comment-27150130-20180117230239

@Valeth Yes it is pretty obvious that what Fou did was basically an equivalent exchange similar to how King Hassan traded his grand saint graph to downgrade Tiamat's god saint graph, both saint graph became servant lvl saint graph. In the case of Fou he traded his sentient, his magic energy he stored to bring Mashu back and it's actually alot gone. Not only he no longer can understand humans, talk with berserkers, he also became a mascot pet now and can no longer turn Beast again. It's also possible for him, as he explained, is because Mashu's soul is still lingering in the time temple and did not return to the Root yet. It was mentioned before that reviving a person is impossible even with True Magic, which is why Fou pulling it off is a miracle beyond True Magic and that had a severe cost.

Meanwhile what Tamamo's mirror does it simply because "i can do that", very different concept here. The exact quote is "the mirror carries power of the underworld, capable of restoring lifeforce and magic energy, and even capable of bringing back the dead". It's basically the authority of the underworld similar to Ereshkigal, but on a different scale. Authorities are basically "I can do this, screw the rules". It's not magecraft, it's not NP, it's not skill, it's not True Magic either. Since Amaterasu has authorities over both life and death, reviving the dead is as simple as "I give LIFE back to this DEAD person". There we go the person is alive again.