Have two on top of deathsinger platform with ToM's and blessings of light to melt the ogres. Otherwise, run normal. Easier than the "leave ogres alive" strategy; for us anyways. Knights should be fairly easy for those on platforms since those guardians don't have to do much to the ogres.
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Ghallisword works well for the Knights :) (Exotic solar sword)
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You would think that but the people who have the last two Knights always -blam!- up
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The last knight is certainly the challenge with this strategy, but we eventually got it down. Need good snipers, which is a skill getting highlighted this new dlc.