User blog comment:EmpyreanSmoke/Weaknesses/@comment-3045936-20151001223032/@comment-209.239.123.107-20151002011518

All angels are not archangels though, they are not the same. There is nothing to suggest Leviathans can kill archangels specifically, only the angels that were still aroud and could possibly fight the Leviathans, which is why Death was talking about them.