Enchantability

Vanilla Enchantability

Enchantability causes some items to have better chances at higher level enchantments than others when using the enchanting table. Vanilla Minecraft has values set for the following:

Material Class	Value	Max Modified Enchantment Level
Chainmail Armor	12	41
Diamond Armor	10	39
Diamond Tools	10	39
Gold Armor	25	48
Gold Tools	22	45
Iron Armor	9	39
Iron Tools	14	41
Leather Armor	15	41
Stone Tools	5	36
Wood Tools	15	41

For more details, see the Minecraft wiki.

Customization

You can specify new enchantability values for items at a material level. For example, you can make only diamond swords have an enchantability of 100 if you really wanted to.

To customize these values, open up "enchantability.yml" and make the appropriate edits. You can copy+paste the default enchantability groups to get started, just give it a unique name and change the types and enchantability value.

For example, let's take the first default enchantability group, wood-tool:

# This is the name you give it. It has no real meaning,
# just should be unique.
wood-tool: 

  # The materials to include in the group. This can be either 
  # Spigot material names or numeric item IDs.
  types: 
  - 'WOOD_AXE'
  - 'WOOD_HOE'
  - 'WOOD_PICKAXE'
  - 'WOOD_SPADE'
  - 'WOOD_SWORD'

  # The enchantability value itself. Mathematically, this
  # is divided by 4, so you need to increase/decrease it 
  # by factors of 4 to see any difference. 
  enchantability: 15