First day of public testing. PTR was online for almost three hours.
Ruby Sanctum contains couple of trash packs, three (emblem-droping) adds (like sartharions lair) and the boss Halion.
what you can see in the vid:

- phase 100% - 75%:
fighting fire-drake

- phase 75% - 50%:
fighting shadow-drake

- phase 50% - 30%:
fighting both drakes, sharing their hp but also sharing an ability which weakens one drake and buffing the other one depending on how many people are fighting which drake. theres a percentage index on the top screen which shows you the current proportion.

when 50% triggers we decide to stay with the shadow mob, trying to weakon the fire mob so we can bloodlust-nuke it. i die right at the point where our dps switches to the ground in order to fight the weakened fire mob.