tier difficulty order

[Zonx]

Weak = solo single or double down
Average = solo no arrows or any solo up
Heroic = 1 group double down - no arrow (may include the toughest solo encounters)
Heroic+ = 1 group any up arrows
Epic = Any mob formerly labled as Epic (may include group triple ups)
Raid2 = 2 group mob
Raid3 = 3 group mob
Raid4 = 4 group mob

Note, Raid 2-4 are modifiers to Heroic and Epic. You can for instance have a 3 group Epic encounter.

Notice how the first 5 all include "Tier" in the image name. These rankings are intended to mimic the 5 tier system used for everything else. Loot quality is very likely tied to or going to be tied to these rankings. Epic mobs will drop the best loot, Week mobs will drop the worst.

Also note these cons are per individual mob. A 3 pack of average mobs would display as a Group encounter in the old system since that system evaluates the entire pack.