I like what Noght proposed. As for combat, the challenge I like (assuming we get to combat reform the reiksguard) the reiksguard champ, hopefully against their unit champ. We want to direct attacks at the dreadlord's, so we don't want to challenge on that side of the combat.
For magic, the 5++ ward, rerollable to wound, iceshard, and harmonic bubble should be the spells we try and cast.
I'd two dice each prayer and then go into the wizard's spells. We should win this combat, but I think iceshard is key to cancel their +1 to hit.