FATMAP difficulty grade
Ride the Great Divide Express chairlift up to just below the summit of Brewster Rock/Lookout Mountain.
At the top of of the chairlift is a gate which can only be opened by a turned-on avalanche transceiver.
As well as needing your transceiver you need a ski partner, a shovel and a probe, without which ski patrol will prevent you from going through the gate. Provided you have a ski partner and are correctly equipped, go through the gate and make the 5 minute hike up to Lookout Mountain.
From the summit of the mountain there are various entrances to Delirium, the steepest of which is X-Dive.
X-Dive can be accessed directly off the summit and is significantly steeper than the regular entrance that can be found off Dive Proper.
X-Dive eventually merges with Dive Proper which will take you all the way to the bottom of the face.