Eldritch Invocations
Eldritch Surge
Prerequisite: 17th level warlock, Eldritch blast cantrip
When you cast a Warlock spell of 1st level or higher as an action, you can immediately cast eldritch blast as a bonus action.
Gift of the Unseen
Prerequisite: 17th level warlock
You can cast invisibility, at yourself, without the need for spell slots or material components.
Gift of the Undying
Prerequisite: 17th level warlock
You can cast death ward, at yourself, without the need for spell slots or material components.
Heavenly Punishment
Prerequisite: 17th level warlock
You can cast fire storm, once, without the need for spell slots or material components. You can't do so again until you finish a long rest.
Notebook of Death
Prerequisite: 17th level warlock, Pact of the tome
You gain a new page on your book of shadows. As an action, you can write the true name of a creature that you have seen in this page. A creature that has Its name written on the page this way and has less than 100 hitpoints dies. You can describe the way in which the creature dies. If a way is not described, the creatures appears to die from cardiac arrest. You also can, as part of the action, write below the creature's name a course of action that takes no more than 1 hour to complete. If the creature would die from the normal effects of this feature, the creature will, before dying, follow the written course of action to the best of its ability. If the course of action is logically or physically impossible, or would take more than an hour to complete, the creature just dies as previously described. Once you write a name on the page, no names can be written again until you finish a long rest.
Arcane Core
Prerequisite: 17th level warlock, Pact of the talisman
When you pick this invocation, choose one 9th level spell from the Sorcerer, Warlock or Wizard spell lists. You can, as an action, cast this spell from your talisman, without the need for spell slots or material components. The spell lasts for its full duration, or until you dismiss it, requiring no concentration. The talisman is destroyed during the process of casting, and can only be restored after 2d4-1 days. You can change the spell cast by this feature when you summon a new talisman.
Rapturing Blade
Prerequisite: 17th level warlock, Pact of the blade
You can attack 3 times, instead of one or two, when you take the attack action on your turn using your pact weapon.
True Form
Prerequisite: 17th level warlock, Pact of the chain
Your familiar can cast shapechange, on itself, once, without the need for spell slots or material components. It can't do so again until you finish a long rest.