DOOM: The Dark Ageshas a moderately sized arsenal that will continue to grow as you play the game. You'll end up with six base weapons, five of which have two different modes. In total, this leaves you with 11 weapons you can buy upgrades for. Upgrade materials can be found in secret locations, or earned through completing challenges. While you'll eventually be able to upgrade all your items, you will have to decide what to focus on before you've earned enough to upgrade everything.