Finally, the Titan Quest skill system will offer an incredible amount of replayability, not only because you have access to 28 different class combinations and different skill builds within those combinations, but also because skills do not become obsolete. In a system in which early skills are phased out and you're encouraged to save all your points for the highest-level skills, half the possible skill choices are effectively eliminated. Even for people like myself, who often replay the same class over and over to perfect it, there is the added challenge of trying to figure out the most optimal advancement balance between leveling your mastery and leveling your skills.