Well - very simple advice for dealing with a Death Roller.
Hit it with a 2 dice defender's choice block (with an assist of course - but make sure your blocker and assister are not next to eachother - to counter Multiple Block). The Roller does not have Block or Dodge. This means you have a 25% chance of getting the roller down. If you don't get it down, reroll - this means you have a 50% chance of getting the Death Roller down. Once they are down they are out. Sure you may burn a couple of rerolls along the way.... but the alternative is the havoc a Death Roller can cause in your opponent's turn. You can bet that your opponent will not score until the last minute while the Roller is on the pitch - ST 7, Multiple Block, Mighty Blow, +6 on Fouls and no need to dodge is a serious problem unless you deal with it - if you run away... be prepared to take lots of pain.
Since you are playing Norse, use a Blitzer to block / blitz the Roller (with an assist of course) - that way you get a chance for a Frenzied second block if you get pushes. Got a Norse blitzer with Dauntless.... well you know what to do! [of course the downside to this is that the Death Roller will hit (or foul)

your Norse blitzer if you fail...... but then the Roller was always going to target the good players anyway].
Oh and don't put the Minotaur up against the Death Roller - keep him well away!
Finally, since you don't mind if the Dwarf coach scores early, for the first 4 turns, don't worry about any Dwarf runners / blitzers moving downfield or gaps in your defence (assuming that the Roller hasn't been knocked out yet of course). Let them run through - of course hit them - but if the Dwarves score early then the Roller may not return!
Alternatively if you have the ball, score asap..... and hope the secret weapon roll is successful!
Dave