User blog comment:EmpyreanSmoke/Weaknesses/@comment-5619706-20151001185224

When did the idea of Leviathans killing archangels happen exactly? The last consensus of the wiki as far as I am aware is that the outcome is difficult to ascertain.

Although I am all for defending the Leviathans because of Death's and Castiel's statements, the semantics are very confusing (i.e., Eve addressed Castiel as an "angel" despite being considered a Seraph) and the execution of the show leaves it confusing (i.e., Castiel can sometimes use his power against a Leviathan and sometimes he can't).

The incredibly ancient beings of Purgatory (Old Ones and Eve) have diminished how we originally perceived the heavenly host's power and yet, recent information (or retcon, I should say) on God needing his 4 archangels to fight a primordial force again magnify the capabilities of archangels.

Lastly, I would like to remind people that the power scale in Supernatural is far from being linear.