Explosive Arrows
This plugin works great with factions. Have you ever wanted a new type of creeper egg in factions? Well this plugin has exactly that. When this plugin is finished it will contain multiple types of Explosive Arrows, it has World Guard compatibility. Also if an arrow lands in SafeZone territory for factions it will stop it from exploding! This plugin stores your arrows digitally and you can buy arrows with /buyarrows [amount]. You can set the price of arrows in the config as well. You need to have Vault and a economy provider plugin to run ExplosiveArrows.
If you're struggling with this, take a look into the AlchemicalArrows API as it will make your life a little bit easier ;)
https://www.spigotmc.org/wiki/creating-an-alchemical-arrow/