User blog comment:B214/Volume 21 info & spoilers/@comment-83.22.170.133-20160319103039/@comment-1359322-20160319133236

It destroyed the main institute belonging to Grigori and the Heaven (from First Heaven to Sixth Heaven).

Many Angels died in a process (Even ones who had been fighting since long time ago).

Three Seraphs were critically wounded. Most of the Four Great Seraphs were also wounded.

Rafael lost one of his leg. Uriel lost an eye and arm. Even Michael was wounded.

Even two of the leaders of the fallen angel was wounded badly.