I've been running into mobs with the "Reflects Damage" ability left and right, and it annoys the hell out of me to skip them everytime.
I'm running with about 27K dps and 40K health, primarily using Hungering Arrow and Elemental Arrow with tentacles with this spec:
If i get 3-4 good hits in with Elemental Arrow i'm down to 10% health, then i find the nearest obstacle and start kiting around in circles, using prep to heal when it's up, more Elemental, pots once in a while.
My spec totally destroys anything else so i wont switch abilities for these packs and lose my valor stacks, but they consistently take about 10-15 minutes depending on their other abilities, unless i wanna chug 15 potions pr pack.
Anyone got some tips for these? Apart for super rape mobs like Fast Waller Mortar Invincible Minions the above is my most hated ability.