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In terms of playing this thing through as an SoS build:
12 Channeling, 11 Communing (5s blind on Shadowsong)
SoS, Vampirism, Bloodsong, Shadowsong, Painful Bond, Spirit Siphon (if you need something for energy management), Gaze from Beyond (more blind), Armor of Unfeeling
Place Spirits apart from another at adjacent + range to negate 100b splash, place Shadowsong last and a bit behind, Painful Bond mainly Warriors if the Spirits focus them, otherwise on their target. Armor of Unfeeling once all spirits are placed, then run over.
Placements on northern kiln is either at the bottom of the bridge or a bit behind in Gadd's range or around the fountain. Placement on the eastern kiln can be at the bottom of the bridge.
Switch between locations as needed, usually every 1-2 mobs. Depending on the kiln bar you can distract destroyers also to get the least few % of progress cheesed through.
The rest of the mission is just slow and methodical pulling with two golems out face-tanking for your spirits.
In the end long bow pull the warrior bosses into your spirits / golems, ggs