For reasons that remain hazy (other than to demonstrate how cunning she is), Waller engineers a love affair between the
Enchantress and Rick Flag (Joel Kinnaman), «the finest
special forces officer this nation has ever produced.»
In the skill tree you can upgrade a ton of different stats; from critical hit damage, magic damage or mana cost, right up to new character class unlocks (which include the blacksmith who sells weapons and armor, the
enchantress who sells runes which grant
special abilities to your character, and the architect who locks the castles layout but reduces your gold collection by 40 %).