If you've used the Amber Drake you're probably familiar with the following ability.
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.
When you're fighting the final boss, you can actually dismount from the Drake and use an ability which gets you out of combat, like Vanish if you're a rogue.
Call a new dragon, and the cooldown on "Stop Time" will have resetted, and you can use it again for freezing the boss plus all the adds for a smooth and easy kill.
ps: wie immer