While you could only download the Unique Units kit, the other two mods add some additional customization options and a few more units as well. Originally conceived under the name “MOAR UNITS,” this trilogy of mods brings a whole new set of combat options to the game. No Civ 6 mod list is complete without Steel & Thunder. Deliverator23 There is so much more power to be unlocked through the Steel & Thunder mod set.