in witch queen we entersavathun's throne world, finding secrets. We could technically find parts of the origin of deathbringers song (uncorrupted traveler's song) and turn that into another rocket launcher or gun. Lore wise the rocket launcher would deal heavy extra damage to darkness enemies: taken, scorn and hive. maybe leave big healing pools for us and those pools continue damaging enemies similar to witherhoard. Deathbringer for dps. "Lifebringer" for clearing out big hordes of enemies instead of dps.