We have had three main antagonists of Gears of War in the series. We had the infamous train finale with General RAAM which was impossible even on Casual. Then we had the cinematic battle in both the Queen's Chamber and the race to Jacinto with the High Priest Skorge, in which he died falling off his Hydra below. Then we had Queen Myrrah and her Tempest mount. Impossible on insane mode, you had to battle Myrrah's overgrown dragon beetle as Adam prepped the Imulusion Countermeasure. And it ended with the Tempest dying and Queen Myrrah giving one more speech before Marcus driving Dom's commando knife in her chest in the avengement of Dom and the millions of deaths caused by her.
So, now that the series is over, which death of these heavy hitters made you hold your hands up in victory and sat back while the son of a ***** died a painful death. So, who is it?