The Twin Colossals (a.k.a. Twin Colossus) are a pair of high vertical mountains, rising up on the west side of Feralas. The road from Feralas to Desolace runs between these two mountains. Some individuals conjecture that these are the stumps of what were once trees that have since eroded and become indiscernible from the surrounding rock and dirt.
At the base of the Western Colossal, there is a Night Elf female, Marli Wishrunner, who gives you the opportunity to visit the top of the Eastern Colossal. She also informs players that they will have to find their own way down. Accepting to be brought up will result in a teleport to the top of the mountain.
At the top there is a good view of the surrounding area, a small lake where one can fish (one wonders how this is possible), and a Night Elf male, Kalin Windflight, who sells parachutes to leave the mountain for 20 silver each.
The pair are apparently in on a kind of scam, for to get down, one needs the parachute. The tricky part is that the parachute is temporary, so if a player opens it too fast, it will be "gone" before one reaches the ground... resulting in a speedy demise. First-time visitors often open the parachute at the beginning of the jump and as a result fall to their doom somewhere halfway. It is suspected that the pair then proceeds to loot these unfortunate souls.
A Mage is of course not required to buy the parachute, as they can use Slow Fall to get down. A Priest can use Levitate to the same effect. A Paladin can cast Divine Shield before hitting the ground to shield him/herself from falling damage. Any Engineer may get around this scam with the use of a Parachute Cloak. Also, players who have revered or higher reputation with the Sha'tari Skyguard can use either a Skyguard's Drape or a Skywitch's Drape as a parachute to avoid the fall.
It is possible to jump on the south side of the mountain, then use the parachute to land in the pond located just next south of the Eastern Colossal, to avoid death from a massive fall.
The Western Colossal is not accessible.
World of Warcraft: Cataclysm
This section concerns content exclusive to Cataclysm.
In Cataclysm, since flying is now available in the original zones, it is now possible to fly on top of either Colossal. In fact, Diamond Head can be found swimming in the pool on top of the eastern Colossal.