Using this package you can create custom enchantments for tools, weapons and probably everything else.

It might be required for you to import the class if you encounter any issues (like casting an Array), so better be safe than sorry and add the import.
import mods.contenttweaker.enchantments.EnchantmentBuilder;

First and foremost you will need to create a Material Builder.
This can be done using the static create method.

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//mods.contenttweaker.enchantments.EnchantmentBuilder.create(String name);
val myChant = mods.contenttweaker.enchantments.EnchantmentBuilder.create("kindlich_chant");

Remember, that you will need to register the enchantment after you've done your changes.
This can be done with the register method which will return a IEnchantmentDefinition of the new enchantment.

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myChant.register();

You can set and get these properties using myChant.name.

name	Type
name name	Type string
name allowedOnBooks	Type bool
name applicableSlots	Type IEntityEquipmentSlot[] (default: empty)
name curse	Type bool
name domain	Type string (default: "contenttweaker")
name maxLevel	Type int (default: 1)
name minLevel	Type int (default: 1)
name rarity	Type string (use the custom methods below)
name treasure	Type bool
name type	Type string (use the custom methods below)

You can set and get these properties functions.

name	parameters	Return Type
name canApply	parameters IEnchantmentDefinition thisEnchantment, IItemStack item	Return Type bool
name canApplyAtEnchantmentTable	parameters IEnchantmentDefinition thisEnchantment, IItemStack item	Return Type bool
name canApplyTogether	parameters IEnchantmentDefinition thisEnchantment, IEnchantmentDefinition other	Return Type bool
name calcDamageByCreature	parameters IEnchantmentDefinition thisEnchantment, int level, String creatureType	Return Type float
name calcEnchantabilityMin	parameters IEnchantmentDefinition thisEnchantment, int level	Return Type int
name calcEnchantabilityMax	parameters IEnchantmentDefinition thisEnchantment, int level	Return Type int
name calcModifierDamage	parameters IEnchantmentDefinition thisEnchantment, int level, IDamageSource damageSource	Return Type int
name calcTranslatedName	parameters IEnchantmentDefinition thisEnchantment, int level	Return Type string
name ​	parameters ​	Return Type ​
name onEntityDamaged	parameters IEnchantmentDefinition thisEnchantment, IEntityLivingBase user, IEntity target, int level	Return Type void
name onUserHurt	parameters IEnchantmentDefinition thisEnchantment, IEntityLivingBase user, IEntity attacker, int level	Return Type void

Use these methods to be instantly notified if you made a typo.

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//Rarities
myChant.setRarityCommon()
myChant.setRarityUncommon()
myChant.setRarityRare()
myChant.setRarityVeryRare()

//Types
myChant.setTypeAll()
myChant.setTypeArmor()
myChant.setTypeFeed()
myChant.setTypeLegs()
myChant.setTypeChest()
myChant.setTypeHead()
myChant.setTypeWeapon()
myChant.setTypeDigger()
myChant.setTypeFishingRod()
myChant.setTypeBreakable()
myChant.setTypeBow()
myChant.setTypeWearable()

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#loader contenttweaker
val builder = mods.contenttweaker.enchantments.EnchantmentBuilder.create("kindlich_chant");
builder.applicableSlots = [mainHand, offhand, feet, legs, chest, head];
builder.setTypeAll();
builder.setRarityVeryRare();
builder.calcModifierDamage = function(thisEnch, level, damageSource){
    return level;
};

builder.onUserHurt = function(thisEnch, entity, attacker, level) {
    entity.health = entity.maxHealth;
    if(entity instanceof crafttweaker.player.IPlayer) {
        val player as crafttweaker.player.IPlayer = entity;
        player.foodStats.addStats(100, 10.0f);
    }

};

builder.register();

builder.name = "other_chant";
builder.domain = "definitely_not_cot";
builder.calcModifierDamage = null;
builder.onUserHurt = function(thisEnch, player, attacker, level) {
    player.sendMessage("EARNED IT!");   
};
builder.register();