In a small group, it can be difficult to cover all four roles, and have a party large enough to deal with normal sized encounters without resorting to playing multiple characters or having the DM play DMPCs or using smaller encounters. Neither of these solutions are desirable, as it can be difficult to play and DM at the same time (or play multiple characters), and smaller encounters are just boring. These rules, based on the third edition gestalt rules from Unearthed Arcana, allow a character to take two classes of different roles, effectively doubling the power of each character.