high level supernatural creatures have strong ass weaknesses. holy oil can trap archangels and they can be warded off, so thats not suprising. dont forget leviathans were beaten with pinesol. the men of letters is something they should have done a long time ago. more of building up that introducing a new branch though
theres also the fact that sam and dean hunt on little to no funding with just themselves and the random hunters they come across. but then again, weve also have known for a while that the men of letters were arrogant as fukk, and thats what led to their downfall. their scientists, not warriors
No like that Knight of He'll bytch said, they are Librarians
I get the holy oil shyt but magical brass knuckles