During the encounter Siege the stronghold, You escort an NPC named Glenna down a dangerous path. 

Required:

• A Mesmer with Portal Entre and following masteries: Bouncing Mushroom, Forsaken Thicket Waters and Ley-Line Gliding.

Helpful but not required:

• Personal and Shared Stability for white mantle attacks as they can knock you back into mines, Killing you instantly.

External Links:

• Guild Wars 2 Wiki Rewards.