Removing Illusion, you'll won't be able to duel if you're not an Imperial. Dealing with multiple opponents, I'd recommend being a summoner, using atronachs for different kinds of situations. Also Dremora Lords are just like the Blademaster! They love destroying challengers. Full light armor perks really wouldn't be that helpful as Blademaster's Mask is heavy armor and light armor is only for having a high armor rating.
Removing Illusion, you'll won't be able to duel if you're not an Imperial. Dealing with multiple opponents, I'd recommend being a summoner, using atronachs for different kinds of situations. Also Dremora Lords are just like the Blademaster! They love destroying challengers. Full light armor perks really wouldn't be that helpful as Blademaster's Mask is heavy armor and light armor is only for having a high armor rating.