Or report spam feature. Much simpler.
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I know about the underground bots.
The bots that I saw at Sagolii desert around the sundrakes area could not be targeted by the mob at all. I know how to use target-of-target, but it only works if the mob could actually target their attacker.
Edit: No, they were not ninjas. They were all thaumaturges using Fire 1 repeatedly just as the sundrakes spawned.