Editing Taming The Westmark (section)

===Missile Use===
*Consider the common D&D dice: d4, d6, d8, d10, d12, and d20. For any collection of missiles, round up to the nearest die. For example, if you have 13 arrows, you would roll a d20. Every time you use one or more missiles in combat, roll the respective die at the end of combat. If you roll under half, drop to the next lowest die. When you hit a d4 and roll a 1 or 2, you're out of missiles.

*Seems a bit unfair to have 20 arrows, fire one, roll under, and drop to a d12 so we'll say you have to roll under twice with a d20 to drop to d12. 

*"Roll under" means you roll one of the lower half of numbers on the die. 
**d4 = 1-2
**d6 = 1-3
**d8 = 1-4
**d10 = 1-5
**d12 = 1-6
**d20 = 1-10

*Note that your monthly cost of living fee covers missiles so you can always refill your total by visiting any merchant who sells them, or if you find some in the wilderness.