This is actually a reward from a quest from one of the Toskirakk slave npcs (located near the zone-in). The mission is called "Streets Of Justice", and it involves killing:
- 5 "shivstalker" ogres (4k hitters)
- a named shivstalker called Basta Shivstalker (5.5k hitter)
- looting Basta Shivstalker's head and bringing it back to the quest-giver
- another named ogre called Kurokk Gakk (4k hitter, cons indifferent, not sure if this is the correct npc name)
- looting Gakk's head and bringing it back to the quest-giver
Completion of the mission yields:
60 chronobines
+faction with Toskirakk slaves
+faction with Mutius, Herald Of something-something (he's a merchant npc near the Tosk zone-in)...
-faction with Toskirakk Rallosian ogres
a Miniature Rallosian Helm Shell
(will update post with more details once I decide to run through the mission again)
So far, I would say that this zone is equivalent to Crystallos in difficulty with tightly packed mobs.