Beat the Blackburrow Boss

Quest giver: Raxtor Darkpaw
Requirements: Freedom!, Summary Execution, Invading the Invaders, and What Evil Lurks in the Hearts of Gnolls?
Request Phrase: help
Entry Phrase: click into Blackburrow
Reward: 11 Chronobines, Timeshear Purple Fragment Ena

Inside clear your way to the waterfall and float down to the bridge that heads to commander area, you'll get knocked back by a ward as the task updates. At this point keep killing "gnarls" until you get a Blackburrow Runestone. Click the Runestone as close to the ward as you can to deactivate it and allow you to pass.

Beyond the ward you find Vel`tix and 2 friends, kill off his friends then beat him until he gives up around 50%, hail him, follow the dialog, and he gives you a key. Float down to the bottom and head north a bit to find a metal gate, use the key to pass through and Gnarl Sawbones Brankt attacks. Defeat him but don't go any further or you will get swamed by legionnares. Head back to Raxtor and give him both the runestone and the key to complete the mission.