The other characters are all mine and were offline during the entire encounter, I did not use them to do anything during the fight, they are just my lootbots.
Did the entire quest on epic elite (took around 25-30 minutes) then the white dragon on epic elite solo. Took me 2 tries. The first time I stepped in and instantly got killed by a destruction before I even landed a single spell. My strategy was to keep both the dragon and the giant at around the same hp and just run around. Keep distance from the giant or he will severe stunning blow you which will cause you to trip which can be deadly. Was pretty intense at some moments when I was below 20% hp but went fairly smooth. I imagine in a week or two when I master this I will be soloing it all the time with no difficulties. Time to try the black dragon, and then the blue dragon!