User blog comment:EmpyreanSmoke/Leviathan VS Archangel/@comment-27006668-20150923141417/@comment-213.152.161.101-20150925001801

Castiel fought 2 Leviathans for routhly 10 seconds and they nearly killed him, Dean/ or that vampire (don't remember any longer) rescued him. Maybe archangels could last a bit longer, but they are basically humans in the presence of Leviathans. Dick would kill them instantly.