Still thinking of how to implement a Raid-type mechanic for WoW (Warriors of Waterdeep) similar to WoW (World of Warcraft; I’m an avid WoW player. Actually ‘avid’ is an understatement). So in lieu of a ‘Raid’ how about something that make a guild strive to a goal–maybe a Weekly (or Daily) Guild Quest? Some examples will be ‘Clear 200 Heartcoil Deeps’ or ‘Collect 1000 Gems’ etc.
Also I’m suggesting a Guild leaderboard–for Guild Quests completed give it an assigned ‘Guild Prestige’ value.