Just a tip; if your looking for nice "grind" mobs for a group at 84+ try "a crazed mercenary" in Feerrott, The Dream, at Investigator Spatner (he's one of npcs associated with the Merc quest)
I'm finding, even if they are close, they pull as singles, hit less hard than other mobs in zone and relatively easy to take down with average dps group. Dropped to deep blue at 85, keep a tight pull radius to avoid patrolling lizards and high level snakes. They re-spawn quickly and there are enough for constant pulling for single group - just be aware of people running Merc quest and pause to let them get their kills.
I'm finding, even if they are close, they pull as singles, hit less hard than other mobs in zone and relatively easy to take down with average dps group. Dropped to deep blue at 85, keep a tight pull radius to avoid patrolling lizards and high level snakes. They re-spawn quickly and there are enough for constant pulling for single group - just be aware of people running Merc quest and pause to let them get their kills.