Let's rewind time a bit, back to when the will of the Moon Tree had just escaped the curses thanks to the aid of the elf corpses.
From the Aspect of Silence, a hand reached out to catch the will of the Moon Tree, pulled him into the Aspect of Silence, then hurriedly ran away.
Looking at the upper half of the figure that was still pinned on the withered Moon Tree, the will of the Moon Tree laughed: [Fight, keep fighting, all of you fight!]
He had no reasons to reject Eternal Heat's request. While this would only force him to spend what little power he had left, it would also make the battle of the Seven Gods escalate even further, which lowered the chances of the ultimate winner pursuing him.
[It's a good thing that Negary helped me by raising a group of elf corpses that can use the power of Error, otherwise, it would have been really difficult to manipulate anything from the inside]
