Gifts of the Blade
At 2nd level, a warlock gains the Eldritch Invocations feature. Here are new options for warlocks with the Pact of the Blade feature, in addition to the options in the Player's Handbook.
If an eldritch invocation has a prerequisite, you must meet it to learn the invocation. You can learn the invocation at the same time that you meet its prerequisite. A level prerequisite refers to your level in this class.
Blade Vault
Prerequisite: Pact of the Blade
You can perform the ritual to transform a new magic weapon into your pact weapon without breaking your connection with your current pact weapon. You can store a number of magical weapons in your pact weapon's extradimensional space equal to your Charisma modifier (minimum of two).
Each time you create your pact weapon, you decide which weapon appears. When you do, you can end your attunement to any of your other pact weapons and immediately attune to the weapon you summoned (if it requires attunement).
Living Weapon
Prerequisite: Pact of the Blade
Your pact weapon develops sentience, which inhabits any weapon you summon with your Pact of the Blade feature. It has an Intelligence score of 14, a Wisdom score of 12, and a Charisma score of 16, and shares your patron's alignment.
While holding your pact weapon, it can communicate with you telepathically. It has hearing and darkvision with a range of 120 feet, and it understands your languages. In addition, it has proficiency with two of the following skills of your choice: Arcana, History, Insight, Investigation, Nature, Perception, or Religion. Your pact weapon has your proficiency bonus, and it can help you with ability checks using the skills you chose.
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Pact's Shadow
Prerequisite: Pact of the Blade
Whenever you create your pact weapon, you can create an illusory copy of it in your other hand, provided it doesn't have the two-handed property. The copy doesn't gain the benefit of a magic weapon's properties, but counts as your pact weapon for the purposes of your warlock features. You can engage in two-weapon fighting using both weapons, even if they aren't light, and you can perform the somatic components of spells even while you're holding both weapons.
Steel Skin
Prerequisite: Pact of the Blade
When you create your pact weapon, you can cause a suit of armour to flow across your body if you aren't wearing armour. You can choose the form of this light or medium armour each time you create it (see chapter 5 of the Player's Handbook for armour options), though it always resembles the form of your pact weapon. You are proficient with it while you wear it, and it doesn't impose disadvantage on Dexterity (Stealth) checks.
This suit of armour disappears when your pact weapon disappears. It also disappears if you ever doff it.