"Power? Manipulate Fire. But don't imagine him as a Flame Demon. If a Flame Demon is like a warrior, then Disaster is a skilled spellcaster who controls fire. He can draw upon people's pain and sorrow by causing fires. City fires, forest fires—these all strengthen him.
"Rumor has it that he once burned the realm of dragons and also started a great fire in the Holy Tree Forest of the Elven Kingdom. The legends of this demon are not as ancient as those of Stone Mirror Demon-Goth or Misfortune Demon-Pharnalius, but he is absolutely no ordinary evil spirit. If it is him..."
The Doctor narrowed his eyes slightly.
"I think that explains what happened three hundred years ago. Disaster's main body is flame itself, so he has the power to split himself, allowing any of the split-off individuals to become the main body. The Church may not know this secret. I suspect that although the Nature Church dealt him a severe blow and sealed away most of his flames three hundred years ago, his remaining power lay dormant in the woodland until reappearing now."
"Splitting flames... so he can also absorb other flames to strengthen himself?"
Shade asked again, thinking of the stolen Woodland First Fire spark they had found today.
"Of course."
The Doctor nodded at once.
"I know you possess a very powerful flame that can burn everything to ashes—the Primordial Fire, right? As long as he has come into contact with that flame even once, he can become immune to its attacks to a certain extent. So don't think about using your fire against him.
"Only water, ice, and cold are Disaster's weaknesses. This thing is troublesome. Fortunately, from your description, the Church dealt him great damage in the past. He likely has not fully recovered yet,