GBL = Generated By Lucifer

The GBL set of dungeons; Branch, Lab, and Hatchery, are largely considered to be the worst dungeons in the game. The quests are all repetitive and time-consuming, and the bosses are the hardest up to that point. The exp you get from these dungeons is worse than those that are lower level and easier. Some parties literally cannot put out enough damage to kill the Hatchery boss.

Having just gotten my summoner up to 35, I headed to GBL with the hope of quickly pounding out some GBL quests. Unfortunately, there is almost never anyone in the GBL channel "Coastal Junction," and usually not many people there in other channels. After aboutt 15 minutes of waiting I got into a party and cleared the first GBL dngeon, Branch, twice. I did about 15 more runs and only completed about 7 quests, i still have an almost full quest log for GBL dungeons.

Nexxon already lowered the experience required to level in this game by about 75% in the last 22 weeks, but GBL still feels like an endless grind, just because the quests are so repetitive. If you can afford it I highly recommend unlocking the Chamber of Blood in behemoth, starting with the quest Mercellus' Journal at lvl 36. It's much faster and easier to level to 37 and unlock storm peaks in Chamber of blood than GBL.