Freebooters in the Star Lanes
Spaceships are powered by geotic engines, which generate a field of elemental power around a structure that moves the structure at the command of a living mind at the controls. Geotic engines have many types, Fire Shard Engine (resistance to fire attacks, improved speed) but all have at their heart an elemental shard. These shards are rare and valuable, and can be found by minding near elemental nodes or in the hearts of ancient dragons.
Earth Shard Engine (resistance to physical attacks, improved stability)
Air Shard Engine (resistance to electrical attacks, improved maneuverability)
Water Shard Engine (resistance to cold attacks, improved stealth)
Wood Shard Engine (resistance to toxin and disease, improved repair)
Great Dragon Shard Engine (very rare; resistant to all damage, improvement on all stats)