Warpcraft

Warpcraft are ships or other crafts designed specifically for translating through the various realms of the Omniverse. Most of them, certainly the practical ones, are sealed against air leaks and are capable of journeying through space. 
Warpcraft are common to most major groups who translate through the realms of the Omniverse. The Order of Purgatory don't really use them because their specific powers cover their needs adequately. The Infinity Lords make extensive use of Warpcraft and many Spires and strongholds of Infinity Lords have dockyards where Warpcraft are designed and built.
The Disciples of Infinity also build Warpcraft for their fellow Nazoreans. 
Rift Wolves lack the resources to build Warpcraft, they normally just steal them from others. Small 'fleets' of Warpcraft manned by Rift Wolves hunt the area around the Scorched Earth realm looking for prey.