I want start by saying I have Gjallahorn but I'm trying to help a friend who doesn't have one, do it without using a Gjallahorn. Any helpful advice would be greatly appreciated.
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Go to left kill servitor. Do whatever damage you can to skolas. Move to other side when he gets close. Clear up adds while on that side. Move back to left side. Damage skolas. Keep doing this while you dismantle mines and swapping the tainted light. Do mines as a group. They dismantle quicker. Defender titan is great to have for middle mine. After the mines are done the second time you should be able to finish off skolas. When moving around from one side to the other keep going in 1 direction. Make a big circle. Use taint to time moves. Wait at one side until you need to trade taint then move to other side. Trade taint damage skolas/clean adds. Trade taint and move. Rinse repeat.