Rift Quest:Thwarting the Emberlord  

Adriana and the others will help you, so this is not as bad as it seems. Afterward, click on the small blue orb floating in the middle to be translocated to the top of the tower.

If you do not want to fight your way through all the Dragonians in the Redoubt to get to the tower, there is a fine-line path, starting at about (8260, 7123), where you can jump your way up the cliff to the backside of the tower.