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Initially Prince Taldaram will be engulfed in a shield of blue light, and unattackable. In order for the group to render him vulnerable, you need to clear the two platforms opposite of his platform - two web bridges lead to them, and there are two Frostbringers and two Eyes of Taldaram on each of the platforms, alongside with a Nerubian object that causes the magical field to "diminish" (first object), and then "disappear" (second object). Activating those two is instant cast action, so you can do it while battling the Frostbringers and Eyes.