Agonizing Blast:
When you cast eldritch blast, add your Charisma modifier to the damage it deals on a hit.
Armor of Shadows: You can cast
Mage Armor on yourself at will, without expending a spell slot or material components.
Book of Ancient Secrets:
You can now inscribe magical rituals in your Book of Shadows. Choose two 1st-level spells that have the ritual tag from any class's spell list. The spells needn't be from the same spell list. The spells appear in the book and don't count against the number of spells you know. With your Book of Shadows in hand, you can cast the chosen spells as rituals. You can't cast the spells except as rituals, unless you've learned them by some other means. You can also cast a warlock spell you know as a ritual if it has the ritual tag.
On your adventures, you can add other ritual spells to your Book of Shadows. When you find such a spell, you can add it to the book if the spell's level is equal to or less than half your warlock level (rounded up) and if you can spare the time to transcribe the spell. For each level of the spell, the transcription process takes 2 hours and costs 50 gp for the rare inks needed to inscribe it.
Devil's Sight:
You can see normally in darkness, both magical and nonmagical, to a distance of 120 feet.
Maddening Hex:
As a bonus action, you cause a psychic disturbance around the target cursed by your hex spell or by a warlock feature of yours, such as Hexblade's Curse or Sign of Ill Omen. When you do so, you deal psychic damage to the cursed target and each creature of your choice that you can see within 5 feet of it. The psychic damage equals your Charisma modifier (minimum of 1 damage). To use this invocation, you must be able to see the cursed target, and it must be within 30 feet of you.
2x Far Scribe:
A new page appears in your Book of Shadows. With your permission, a creature can use its action to write its name on that page, which can contain a number of names equal to your proficiency bonus.
You can cast the sending spell, targeting a creature whose name is on the page, without using a spell slot and without using material components. To do so, you must write the message on the page. The target hears the message in their mind, and if the target replies, their message appears on the page, rather than in your mind. The writing disappears after 1 minute.
As an action, you can magically erase a name on the page by touching it.