sorry for the late reply; just catching up with some forum things now
the damaging rings are green when they appear, and they don’t do damage. After a couple seconds they turn pink and you can get hurt by them.
I’m 90% certain that sprite world and ddocks are going to be reworked soon. Those dungeons were announced in the same post as cdepths/sewers/wlab, so I think there was just a part 1, and part 2 is coming soon. They may have just scrapped it though