Aurora Glade--Demagogue?

Yes it is,

The way I normally do it is going to the middle shrine (not evening turning it blue) and follow the middle path (I don't worry bout them capturing the other shrines). Then I'm using either cornerblocking or an SoS-build to stop the runner to the middle. Make sure you alway kill him (there are bout 5-6 runners in total the profession differs). Inbetween runners I always advance up the enemy troup slowly, always keeping in mind that if there is a runner, I need to block him. As soon as you killed all enemy's there will be one red dot left (the demagogue). So take your time and relax. first kill the demagogue and then take all the time to explore the area if you need the explorer title and then turn the three shrines blue.

The most tricky part is to block the runner all the time. beside bringing lots of spirits and using the corner to block it is also good to bring skills like icy prison (ele water skill that slows) and skills like move like a dwarf (causes knockdown). off course extending your party with lots of minions helps as well in the process of blocking them. There are a limited number of runners? If that's the case I'll just attune one crystal and then take my time killing them. I'd assumed that the runners spawned infinitely as long as all 3 weren't attuned.

I leave the middle alone and head to the left shrine immediately...they should just be leaving as the party gets there...turn the shrine blue and flag the party at the left shrine (hard mode i flag them apart to avoid aoe spells hitting the entire party, nm doesnt matter)...then i run back grab a crystal and turn the right shrine blue...then grab another crystal abd head back to the left turn it blue...at that point its basically running back, grabbing crystal and turning the left shrine back to blue if it turned red when you left to get another crystal...and just repeat a few times. If your party is good and you dont delay getting to/from the pedestal, you never have to worry about the right one after you turn it blue the first time. Then when all the runners (and pretty much all the mantle) are dead, you can go get the bonus...since the middle shrine will still be red. Once the bonus is done, just grab one more crystal and do that middle shrine and your done. Having some form of speed boost helps take the angst away but not needed once you get used to it. This is how I always did it as well, it's pretty much a no brainer and safe.
And if you read the parts I bolded, it takes into account the demagogue. He'll be all alone at the place all those white mantles came from.