How do you tell the order in which to step on the plates once a pillar or two are gone? Afaik there should be a white light beacon on the plate that should be activated when its pillar is gone, but when we tried to beat the warpriest last night, there wasn't. We tried two runs on the Warpriest and failed because of that.
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Where the pillar used to be you will see a bright red (might be mistaken on color) light. That is how you know the order. I can't remember if the light is red then turns white when you step in it, or the other way around, but there's definitely a light.