The alternate win condition is based onthe battlefield you create. The book has i think 16 different pre made fields, each with a pre determined V'tar point. The first to either kill the mage, or reach that number of points wins.
There are spells that give you bonuses based on your V'tar. So you can still gain the V'tar points to get the spell bonus, while not playing to a score leaving the only win condition as Kill the enemy mage.
Also some of the tiles in the game have effects. So you could leave those in place to allow the batlefield to become more interactive.