Super. Aren't you special.

Then maybe you should use your head to think about what the nerf really means. 5 seconds extended on the debuff means that a proper tank dipping the boss in and out of the lava just before the debuff expires would allow an extra 5 seconds per stack, so an extra minute of DPS time assuming 10-12 stacks. This, of course, is with perfect play. So this changes nothing for perfect players who don't find it a challenge in the first place, but hastens the fight.

This, however, allows the learning curve for less-than-stellar tanks to not be so steep. The people just learning how to position mobs and getting used to properly dipping him would still only stack it 4-5 times before they inevitably screw up, so it allows DPS to carry more of the burden for damaging it the extra 20-seconds tops. I dunno about you, but putting all of the difficulty of a fight on the tank alone is bad design, that means an otherwise stellar group that's grouped with a tank that's learning gets a hard time, and no one enjoys it.

So we beat it pre-nerf, grats, but the nerf is a change that barely means anything at all. It's like nerfing Mimiron's Rocket Strike to do 4 million damage instead of 5 million damage, none of the strategy changes at all.

Oh noes, the dungeon is hard, let s nerf!

Not sure why the OP was modded down. I can't see what's the problem with the duration either. Even if you lose the stack, the only consequence was spawning adds. Those adds hit like nothing even on clothies and the dps just have nuke them down. (ie tanks don't have to pick them up). With crappy gear on tank, it's actually better if you keep the stack low around 5-7, and lose the stack completely and then kill adds. Only thing this change makes a difference to, as far as I can see, is doing the 15 stacks achievement. You'll be able to stay on the lower stacks for 5s lower.

If you are actually trying to tank and pick up the adds, you are doing the boss wrong.