When doing solo DON faction task to collect 6 frothing drake bloods, the mob level depends on your level. All the drakes in the delve con green or light blue to a level 65, but the diviners don't see through invis, unlike the others. They get off quick heals between 40% and 20% so you gotta keep hitting to interrupt. Killed half a dozen of these without getting the drop I am looking for, better ratio with spellbinders and regular drakes, though probably just luck.
Cuen Anastasio
65 HE Ranger