User blog comment:Zathronas/Analysis by an author: Volume 2 episode 9: Search and Destroy/@comment-10390252-20141003134556/@comment-10390252-20141003152810

FWIW, I think those Goliaths were about as big and powerful as Grimm get but that's plenty powerful and a large group of them could easily cause a huge amount of damage before they could be destroyed.