I might be a noob (in MP), but I do not have to be educated by my enemy

That just feels like not being taken seriously. And I still hope that you will regret that.
I figured by myself that I have Lord Wardens with MR 16. But thanks for the information about the rainbow armor, didn't know about its MR buff. But its rather weak as armors go.
I have to deal with some Barbarians and a Vampire count for now, but I will come back to you, fear not.