I'd expect a lot of 'Runecrafting' for an answer, but honestly, I think it's dungeoneering.
There's only one place to train the skill, and its setup is best described as a complex minigame. It takes a lot of time to figure out, as the formula that calucates xp gain is a complete mystery to beginners, and you have to sit through an extensive trial mode before you can really start training. It's also a skill that doesn't look like any other skill you encountered so far, not to mention it's dependant on ALL other skills.
All in all: extremely overwhelming for new players to commence training. Dungeoneering differs from normal skills in nearly every way, including the complexity of getting started.
12-Feb-2011 17:05:45