This is the faster way to kill the boss, so it might even be used to do the speed run , but it's hard to make and may lead you to a wipe.
You will be able to do the achievement Ruby Drake and Emerald Drake in a single run
Here's what u need to know before attempting with 3 bronze drakes
the 3 bronze drake spells are these:

Button 1: Shock Lance (60 yds) - Instant - Deals 4822 to 5602 Arcane damage and detonates all Shock Charges on an enemy dragon. Damage is increased by 6525 for each detonated.

Button 2: Stop Time - Instant - 1 min cooldown - Halts the passage of time, freezing all enemy dragons in place for 10 sec. This attack applies 5 Shock Charges to each affected target.

Button 3: Temporal Rift (60 yds) - Channeled - Channels a temporal rift on an enemy dragon for 10 sec. While trapped in the rift, all damage done to the target is increased by 100%. In addition, for every 15,000 damage done to a target affected by Temporal Rift, 1 Shock Charge is generated.


Anyways:
1) Everyone takes Amber Drake
2) 1 Person out 5 start using Temporal Rift
3) Other 4 persons start spamming Shock Lance
4) The 1st person gets 10 Shock Charges
5) The 4 persons stop spamming shocklance and start using Temporal Rift
6) The 1st person uses Shock Lance
7) The empowered shocklance will give istantly 10 charges to the other 4 drakes
8) The 1st person start using TEmporal Rift
9) The 4 persons uses shocklance

FOR WHO DIDN'T UNDERSTAND
Easy Version
1Person = X
4Persons = Y

1) X Uses temporal Rift
2) Y Use shock lance until X Get 10 charges
3) When X got 10 charges, all Y people use Temporal Rift
4) X Uses shock lance when he sees every Y is using temporal rift

Repeat...


(Trick/Bug, if the healer drake's dies and the healer falls on the surface just under the boss, he can heal the dragons : )

Tips:
Use the stun (button2) When the adds starts coming or if you loose the coordination (it will gives istantly shock charges to you)