10 Most Powerful Characters Killed By Hal Jordan's Green Lantern
3. Multiple Green Lanterns - Green Lantern #49
As mentioned earlier, a grief stricken and Parallax-possessed Hal Jordan sought to destroy the Green Lantern Corps after the Guardians of the Universe forbade him from rebuilding Coast City. Before going up against and ultimately defeating Sinestro, the Guardians had dozens of Green Lanterns brace themselves for the impending bout with their former ally.
Unfortunately for the Lanterns, each one of them was no match for Hal's wrath and fell in battle. Even powerhouses such as Kilowog were not spared from the rampaging Jordan. After this massacre (and the earlier mentioned death of Sinestro), the Guardians realised that they stood no chance and transferred all their energies to one Guardian named Ganthet, killing themselves in the process.
Once the Guardians no longer stood in his way, Hal proceeded to absorb all the energy in the Central Power Battery, killing numerous Green Lanterns who were in space or other hostile conditions.