45-53 Easy Grinding Requires a high lvl helper

Enter BRD and get to General Angerforge.

The lvl 80 your with stands near the bottom of the ramp that leads to Golem Lord Angermarch (or whatev his name is)

Pull General Angerforge and run to your 80. When you are close, shadowmeld/vanish. There will be 4 Firelords that spawn, Kill them and they will instantly respawn forever. Meaning you can grind them endlessly.