Pyrelord and Controller is one of the more straight forward fights in this zone.
You will want to make sure that your raid has SINGULAR FOCUS on for at least the first part of this fight. You will want to burn down the Controller first.
The Controller spawns little fire adds that will taunt your raid members. If your raid is not paying attention when they are taunted on to one of the fire adds they will proc damage and a power drain on your raid. So tell them to pay attention or use a targeting macro to get back on the controller.
Once you kill the Controller you can focus on the Pyrelord.
Nothing really special about the AOE's on this guy. Tank and spank.