Horrorterrors exist on the most fundamental layer of the cosmology

On the most fundamental layer of the ecology/cosmology, you have the horrorterrors, huge beasts we can't fathom and have no earthly basis for comparison (except Lovecraft's garbage, obviously). But the layer closer to the plane of existence we relate to is governed by an ecology of fauna we can also relate to better, which is an array of reptilian and amphibious creatures, with frogs being the most important. So important that they are the vessels for all physical reality we understand, and all other lifeforms on this order play a subordinate or auxiliary role in the cosmic makeup.

-Book 6 page 123