You can create an additional number of weapon oils equal to your Intelligence modifier. You may also choose to craft one of the following oils as a part of the crafting proccess.

Oil of Permanency

You craft a special oil that has a permamant effect on a weapon. Choose one damage type: acid, cold, fire or poison. When you deal damage with a weapon coated with this oil, you deal damage from the chosen damage type, instead of the damage for that weapon.

In addition, all your attacks with this weapon gain 5 feet of reach.

Oil of Absorption

Whenever you reduce a creature to 0 hit points or score a critical hit when your weapon is under the effect of this oil, your weapon absorbs part of the life force of your opponent. Your next successful attack until the end of your next turn deals additional 1d8 necrotic damage, you then heal the same amount.

Oil of Metal Skin

When you coat your body in this oil as an action on your turn. You gain the ability to harden sections of your body for a brief period, deflecting an incoming attack. When you are hit by a melee attack that you can see, you can add your proficiency bonus to your AC, potentially causing that attack to miss. This effect lasts for ten minutes. This effect can be ended early if you are covered in water or fire.

Oil of Thickness

Your skin become thick as an animal hide when coated in this oil. While not wearing armor, your AC equals 10 + your Intelligence modifier + your Constitution modifier (max 22). You can use a shield and retain this benefit. This effect lasts until your next long rest.

Oil of Protection

This is a special type of concoction, that creates a special cover over the skin of your homunculus or primordial, enhancing its abilities. The homunculus or primordial gains resistance to all damage types while this potion is active (except psychic).

In addition, you may infuse it with one of your weapon oils. The homunculus or primordial then deals additional damage equal to the chosen sword oil chosen with its attacks.