Bukkit

Arrow:
  Temperature: 15.0
  ExtraDamage: 2
  Cost: IRON_INGOT/1
Bow:
  Enchant: SILK_TOUCH/1
  Name: Vampire Bow
  Costs:
  - EMERALD/10
  - 351:4/10
  - WATER_BUCKET/1

Arrow:

• Temperature: temperature added to vampire on hit.
• ExtraDamage: extra damage done to the vampire. Each 1 is a half heart so 2 comes out to 1 heart.
• Cost: item required to fire the bow.

Bow:

• Enchant: the enchantment the plugin uses to identify the vampire bow from normal bows. It is set to silk touch because this is normally unobtainable, which makes going to a light altar the only way to get a vampire bow.
• Name: the name set to the bow.
• Costs: items required to make the bow at a light altar.