IThe mark four is the standard reactor on all Tauri ships from 2060 onwards. It is the most stable, cost effective reactor the Tauri have built. It has a standard output 800% greater than the origional mark I, just above the mark III. Standalone reactor is small enough in comparison to most fleet ships to be used as the primary reactor while not taking up large areas of the ship. On larger ships, multiple mark IV's are used in tandom for additional power. * Mark V * Mark VI * Mark VII * Mark VIII