Three Gjallarhorn. 19-21(depending on armor or three participants) rockets after three lieutenants but before tank. If not pop a synth before starting tank. Two positioned at end behind blast shields, one top left closer to Valus. 19 Gjallarhorn shots took him to less than a quarter health. Take cover for second, pop a synth and repeat. 20 minutes total, skipping Iron Line area, no wipes to orbit but a few deaths and revives here and there.