Game: Dark Souls (2011)

One is a bulky giant with a hammer forged to kill. The other is a lanky knight with blinding speed and merciless skill of the blade. Together, this duo has sent more players to RPG graves than most bosses. Smough wields massive crushing attacks. Ornstein releases long-range arcs of slicing fury. What makes these two even more lethal is the fact that as one dies, the other gains from the loss. This symbiotic relationship along with their lone skill is enough to put them on a top boss list for certain.