The class determines which slot the mod goes into. The energy cost determines how much of your ghost's energy the mod takes up. Ghost mods are the the primary element of ghost 2.0, and are what will be affecting the actual game.
In addition, masterworking your ghost by fully upgrading it also unlocks its fourth activity slot.
Ghosts can be upgraded all the way to ten energy. Whenever you upgrade the tier of your ghost, it gains one energy.
All ghost shells can be upgraded, except for the new light generalist shell (if you want it's look, use the Io shell). Unlike armor, upgrading your ghost is far cheaper, not requiring any enhancement prisms or golf balls. The key enabler for ghost 2.0 is a tiered energy system, similar to the armor system. This year's 2.0 is the ghost shell, and this is a guide to what you should know about the new system. Another year in Destiny has arrived, which means Bungie has 2.0ified another thing in your inventory.
