At long last, I finished the paladin epic charger quest. I've had this quest for so long, and failed it so many times. After a while, I just stopped attempting it.
Today I joined a guild group trying the quest and we rocked Scholomance. We had one heart-stopping moment during the 3rd wave of spirits when three people died. Luckily we got some space and were able to resurrect them.
Then we faced Death Knight Darkreaver. I used my Holy Mightstone, which I had been saving for this day for months, and we just destroyed him!