Impale on Madness advice.
Okay, so some background on my story. Last night was my first night tanking 10M DS on my Prot Warrior.
We went 7/8, one-shotting the whole thing, until we made it to Madness. Now me, being a tank, thought this fight would be relatively simple from my position. All I have to do is tank swap some impales, help dps down some adds, and then tank some mobs in the last phase.
However, upon entering into the fight, I found I simply could not handle the Impales. Popping cooldowns, trying Earthen pots for the extra armor, absolutely nothing helped. I'm relatively curious if maybe I'm just bad, or if I don't completely understand the mechanic of Impale. When it's used, there's usually a short 4-5 second cast time of Impale, and then there's an actual Impale duration. I try to pop my cooldowns about halfway through the cast time of Impale, and it's not seeming to do anything. Even with shield wall up, I was taking 228k hits from the tentacle and ending the whole attempt right there because it looks like I was doing something wrong.
So basically, what I'm asking is, can anyone give me some insight into the mechanic? Maybe tell me what I'm doing wrong? For all I know, maybe I'm just undergeared for it. =/
EDIT: Our platform order is green, red, yellow, blue. I dunno if that helps at all, but just throwing it in there.