Black Gold Online outlines its Guild vs. Guild systems
Guilds in Black Gold Online have plenty to do. Sure, there are the usual social aspects of guilds, but there's also a constantly amplifying race for technological progress combined with territory control. The latest development blog on the official site discusses how guilds can advance and grow in power, as well as the basic outlines of the territory control feature with characters fighting it out over energy wells.
All guilds have a level of technology available to them, determined by the amount of eponymous black gold used to upgrade the guild. This can come from members, or it can come from energy wells, which can be fought over on both a factional and intra-factional basis. It's entirely possible for two guilds of the same faction to fight repeatedly over the same well. Take a look at the full article for more details about how you can send your forces to fight and die for that all-important energy.
