Watched the video again, before the first banish phase, only 2 times stops were used, and Ley-Guardian fired off 2 shots on 1 of the drakes. This would work fine, as the diminishing returns are in affect, but he is only immune after every 3rd time stop, which resets after every banish.

My understanding of Temporal Vortex is that all damage done is increased by 100% per active beam on him, so with 4 beams more or less always active, that one Arcane Lance shot should do considerable damage, also the increased stacks from each time stop in place as well, which explains the speed of the kill.

I'm going to give this one a try in the next couple of days and see how it works out, just need to build some macro's to match the rotation I'm seeing. I've not attempted any other drake fights in Occ for quite some time, been raiding on my 6th account more lately, but I was able to get Amber Void and Ruby Void back in the day when you could kite him with 5 Emeralds, which has been fixed as of today with extreme range of the whelps...