I have a few weapon suggestions
For the Abyss I think Zhalo is the best choice.
For the Deathsinger, I'm pretty sure Sleeper can destroy the Shriekers without them even opening up.
English
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For lamps Zhallov Supercell would. be your best choice For Deathsinger Sleeper Simulant and Iron Gjallarhorn would be your best choice For Crota Dragon s breath Iron Gjallarhorn Sleeper Simulant Touch of Malice Outbreak Prime and Black spindle would be your best choice
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If you use the cheese no thrall will even spawn after you get up the ledge so that's not necessary. Yes it can, but the beam bounced off the wall and killed me multiple times which you don't want to risk while going for flawless raider.