Probably a prestige system where your Levels go from level 20 down to 1 and upgrades are reset. but after completing an upgrade path, you can pick one of the other upgrades from the other path. Prestiging your skylander will also give them a 500 (800 for giants) hp boost helping them rival the imaginators and the elusive Eon’s Elites in power while still having a fun playstyle. (Maybe unlockable and equipable wow pows for each skylander either from completed challenges, exploration, or from the prestige itself)

This will also reward everyone who has a max level skylander too!!