Fixed bug which occurred when casting a single target damaging ability which had its cost temporarily set to free, that would otherwise not be able to be casted.
Inverted healing should now correctly be able to deal lethal damage to an enemy.
Inverted healing is now treated as ability damage dealt by the entity which inverted it.
Several enemy healing Traits which would not trigger at full health now correctly trigger if healing will be inverted.
Fixed bug which prevented Warrior from being properly unlocked if the game crashed before the save file was written.