Classic multibox leveling guide!

[Madsage]

From 50 to 54 leveling in Sunken Temple is the fastest grinding method by clearing dragons and dragonkin in the inner circle and killing trolls in the outer circle when you want to avoid instance lockout. You get to the inner circle by taking the stairs to the far left from instance entrance.

The dragons have very poor loot compared to ZF graveyard and BRD mobs, however they hit for nothing compared to BRD mobs even though they are 1-2 levels higher than them, so you can pull big packs with very little risk of dying.

If you care about the gold make sure you have skinning since 90% of mobs you will grind are skinnable.