system
Given the following post, respond as if you're commenting on Reddit:
human
[It] Pennywise describes itself as “The Eater of Worlds”. While it could probably wipe out a planet, how many worlds could it have eaten if it doesn’t leave a certain geographical location and only feeds for about three months and then hibernates for thirty years?
gpt
Pennywise is a demon from the outer dark.  It was a being that existed before creation and would likely have existed after if not convinced to allow itself to be destroyed.

Some cosmology: in the beginning there was void and chaos in the outer dark.  This sea of primordial possibility was called the Prim.  Gan raised the tower up from the Prim and around it created existence, pushing back the Prim. There were many wonderful and horrible things stranded by the raising of creation.  Many died. Others learned to breath and exist in the light of creation and started to feed of other things... But the process made them lesser.  

They were more constrained by reality and in the case of pennywise he had only as great a power as the beings around him thought he had.  There might have been significantly more trouble if pennywise had landed somewhere else with a more imaginative population.  

It's also possible that what we see of pennywise is only a fragment of their previous power which they began losing as the tower began to fail.  The world is moving on they say.

Long days and pleasant nights.