Warlock gained Metamorphosis in 3.0.2 spell which gives:
"You transform into a Demon for 30 sec. This form increases your armor by 600%, damage by 20%, reduces the chance you'll be critically hit by melee attacks by 6% and reduces the duration of stun and snare effects by 50%."
So this is what we wanna look into. So, as you start a duel as rogue you should build up 5cps and use exp armor, as warlock uses Metamorphosis they wont gain 600% armorcontr. because they had 0armor therefore you'll be able to spam moves as effectly as before the whole demonthingy. Hope this helps ya out abit against those tankiez =)
Original armor.
Armor after expose.
Expose with Metamorphosis.
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