Currently, the fastest way to get there is to use the Wicked hood's teleport, which can only be used 2 times daily, or 3 if all the Wicked robes have been purchased from the Runespan. The second fastest way is to break a chaos altar teleport tablet. Both of these methods teleport the player just outside of the altar. The wicked hood can be obtained by talking to Tam McGrubor, and the teleport tablets by playing the Great Orb Project.