[Angrypokstick]

Originally Posted by Malintex_Terek

Question for me.

Just to add a bit more to what ashlay said

Spoiler for novel stuff:

Well, the silver fire is from the silver knight, he appears to have merged with Yuji and the black fire is from the snake.
yes those three hougu possessed by Yuji are powerful ones but it would also appear that Yuji's training from the flame hazes are paying off as he literally was getting stronger everyday although this may be in fact due to the reji maigo as it slowly gives yuji more existence everyday in addition to recharging him. This is just one possible way to explain how Yuji became so strong in such a short period of time.