Tree castle monster thingy...

once upon a time, there was a village, this village was attacked by a ferocious monster, it ate all the king's people, and livestock. One day a great mage planted a magical seed in the ground where the monster slept. As it went to sleep, an enormous tree shot out of the ground impaling the monster (killing it instantly) all the people and animals were freed from the monster's belly, and the tree absorbed the monster's flesh leaving nothing but bones. The king eventually built a castle upon the great stump of the tree. But the decided to leave the monsters spirit to rest, for anyone who were to disrupt or enter the castle, would awaken the vicious spirit of the monster!

KAIJU COMBAT PLZ?