This method entailed having one titan with blessing, 2 ghorns, and one truth.
Step 1 run to the left side of the map.
Step 2 take out all the adds while ignoring kaliks
Step 3 fire primary ammo at kaliks until he reaches about half health
Step 4 when the mobs start spawning switch to your rocket launcher, place the bubble, and unload all your heavy ammo and maybe a bit of primary.
Step 5 after kaliks is dead kill the fall target and claim your reward.
This method was developed by Rudy_2468, Blackox79, and myself (ricksrighthand) on ps4.
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I used a slightly different method but similar.. Run right when u come in and jump up on platform for some cover.. Kill all the captains and vandals and shanks but leave the yellow bar Dregs alone.. They will despawn in a few seconds , finish killing off the other ads then jump down and lure the boss to the very center.. Have a Titan drop a bubble on the very back center and unload gallys on him, duck into the bubble to synth and keep firing .. If u run out then use black hammer on him.. Don't worry about the target til after the boss is dead then go kill the target and collect loot.. Very easy effective method.. Even did it last time with 2 34's and a 33 and the 33 only used black hammer and HoC...