Inspiration has struck!
+5 Weapon Enhancement (Ranged)
When a projectile fired from a Zerging weapon strikes a target, it immediately transmutes into a zergling. This zergling lives for ten rounds or until otherwise slain.
Hypothetically, for every additional +1 you add, you could upgrade to Hydralisk, Mutalisk, and Ultralisk. I thought this would be a solid zerging tyle weapon because of volley fire being the main way to do archery.
Oh, and in case it isn't obvious, this is for zergling.exe