I keep seeing people asking for "BFD" groups in chat, but I have no idea what that means.
Sure it wasn't DFB?
Death from Below (DfB) is a "sewer trial" introduced in Issue 21 available to both Heroes and Villains, but not Praetorians. This trial can be run at any level and provides exceptional rewards, including experience point bonuses and Single Origin Enhancements, making it an excellent and popular tool for players looking to level new characters quickly.
This trial in some ways replaces the Sewer Network, which was similar but completely unstructured. The Sewer Network is still available for players who wish to adventure there. Players can queue individually or in groups for Death from Below via the Team-Up Teleporter in the LFG Window, a selection on the Chat Window.
When enough players are queued, they will be teleported to the beginning of the trial, which begins with defeating Hellions. Characters are exemplared to level 2 initially, which increases with each cleared section, to a maximum of level 6.
2.1 Defeat the Hellions in the sewers!
2.2 Defeat the Vahzilok in the sewers!
2.3 Clear out the Lost!
2.4 The Hydra Nest
At the beginning of each section, a Longbow Hazard Trainer is present to provide training to heroes, and a Recon Arbiter for villains. It is very common for a low level character to gain several levels from one run of Death from Below. Defeated heroes and villains show up at the beginning of the first section. Additionally, after defeating a boss, a portal opens up between the entrance and the beginning of the next section, allowing any defeated heroes or villains to teleport to that section instead of having to run through each of the segments to get to where their team is fighting. With each boss defeat, the portal changes to drop characters at the section after the last boss defeat.
While not technically cooperative play, the trial is the same for both heroes and villains except for who assists by caption popups. Note that vigilantes may not participate in villain sewer trials, and rogues may not participate in hero sewer trials.
Improved experience rewards from critters in the Trial, large chunks of (amount?) XP for completing each section of the trial, and archvillain XP for at least the two Hydra heads, if not the previous three bosses (depending on team size).
At least two Single Origin Enhancements around the level of the character, which can be well below level 22, when the standard store-purchased SOs can be slotted. If team size is big enough, a character can get at least five SOs from the four bosses. (Mid to high level characters may see SOs drop from the standard critters, as in normal content.)
Your choice of one of four temporary powers. The powers last for one week in-game or until level 22:
Hydra Chemical Accuracy Enhancer +12% To-Hit
Hydra Chemical Damage Enhancer +12% Damage(All)
Hydra Chemical Defense Enhancer +5.25% Defense(All)
Hydra Chemical Recovery Enhancer +15% recovery
never done it myself either BTW.