User blog comment:Crimson and Darkness/Volume 25 discussion blog/@comment-34061653-20180518002915/@comment-41.13.24.126-20180519161319

Apocalyptic level is basically a battle that can destrou the whole world eg Great Red vs Trihexa; Great Red vs Complete Ophis; Complete Ophis vs Trihexa. Basically those 3 beings can have apocalyptic level battles. However the only battle stated to be that destructive or close to it was Ddraig vs Albion. If the 3 factions didnt get involved the heavenly dragons would have definitely destroyed the world with their battle that eventually other mythologies would have no choice but to interviene.