Dragon Age 2: Act 1 Secret Rendezvous: Nightmare Level Mage.

Arguably the most difficult encounter in Act 1 for a Mage playthrough. Here is a non nuclear version (without using Firestorm and Tempest).
It could have ended a minute or two earlier but for the show I was determined not to let any party member drop and so as can be seen, was running Carver around out of harms way at the end in an effort to keep him standing, which added to the length. What can I say, he's an idiot but he's my brother.
Note to self, when commanding characters to move out of the way of an incoming fireball, (which wasn't really neccessary) use the Hold toggle.