Only two of the wardens are around at the area, none of the others show up. The Unseen Hunter is in the lake and will attack if you’re close, and has invincibility.
What’s likely happened is that the other Wardens were killed by some enemy somewhere, and their corpses are still lying around. If you can find their bodies and revive them, the event may proceed normally. Otherwise, it’s well and truly broken and you have to wait for a server reset.
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