Game Development Reference
Figure 5-10: Boss Battle in Legacy of a Thousand Suns
One raid in Dawn of the Dragons involved 23,000 players!
This creates a major incentive for active players to invite their friends and fellow players to join them on the
raid, and promote the game to them. (They can post raid announcements as links on Facebook walls or as links
on third-party websites, which take anyone who clicks it directly to the raid.) These raids have been enormously
popular, encouraging viral growth. They have also become great for user retention, because they often bring