...Ignore carnage... Just pump biotic charge and barrier. Either spec yourself for shotguns or melee damage than go to town. You can solo Primes by essentially charge-shoot in face-charge shoot in face- repeat until dead. They are also great for reviving fallen allies: just charge onto that oponent who is about to boot stomp your friend to Hades and revive them while the enemy's stunned. That charge again to give your allies some space to flee.