Originally Posted by
nathanpbutler
That is what I'm starting to notice too. On PS3 NA, in the evening, you can pretty much bet on beating him at least the majority of the time, if not nearly every time.
For those trying to get this achievement/trophy/pursuit with the killshot before they fixed it, I used a similar method (adapted for new mechanics) as done for the Hellion and Progenitor. I carried a fast-firing SMG, Damage Spikes, and Overcharge, so that when the Warmaster was at just a tiny sliver of health left, I could slap down the Damage Spike, turn on Overcharge, and fire into his arm with the SMG (I think it was a VOT Pulser, but not a Tachmag). In my case, I think I mostly got lucky on the Warmaster, since it had just EMP'ed everyone, and I was close enough to just blind fire into his arm under those last second conditions.
Still, it betters the odds to use a fast-firing or high DPS weapon to pull it off.