The setting of Delis has a number of special mechanics to it.
Crew Actions: Additional options for players to used in and out of combat utilizing the ship’s crew.
Discoveries: A special side-quest system.
Magic Equipment: The differences between Delis and other DnD magical equipment.
Falling Rules: Special rules for falling off into open sky.
Feats: New feats available to players in the Delis world.
Racial Powers: The racial powers for the races in Delis. You gain these in addition to all other powers, not in place of.
Ships: Rules for ships, and there’s a lot of them.
Superior Ranged Weapons: GUNS! Seriously, guns.
Talents: Replacement system for rituals.