User blog comment:B214/Volume 23 discussion blog/@comment-201.215.165.7-20170611043601/@comment-29963364-20170611044533

It was actually stated that Fenrir was on-par with the Heavenly Dragons (individually, not combined).

It could be that his basic stats (physical strength, speed, and durability) put him somewhere between Satan-Class and Heavenly Dragon-Class, and his [God-Killing Fangs] were what made up for the rest.

But, of course, Vali used [Half Dimension] on Fenrir, decreasing his size and lowering his stats (around Ultimate/Satan-Class). But he still kept his [God-Killing Fangs] the way they were.