Think "skip soar" but seven times more retarded and impossible.
Void Meteor, the mechanic that comes right after Big Bang in The Abyssal Fracture (Extreme). It's theoretically possible to skip it due to Zeromus (and Hydaelyn, funnily enough) having HP% instead of Pull Time thresholds for their phase transitions.
Why do people want to skip Meteors? Because it's the one difficult mechanic in the entire fight.
They hate it so much that they're willing to bash their heads against the wall repeatedly until they have enough echo to skip it because one dude on youtube said "IT'S POSSIBLE". (With a team full of IL720+ players who are all potting in OLD EXPANSION CONTENT, and 10% echo).
If you weren't lucky enough to get the mount before the average person who wants to do Zeromus EX became this retarded, wait till 7.2 at the earliest and put a IL740+ limit on your parties. It might actually be possible without echo then.