Warlock

At 1st level, you have struck a bargain with an otherworldly being of your choice. Your choice grants you features at 1st level and again at 6th, 10th, and 14th level.

In your study of occult lore, you have unearthed eldritch invocations, fragments of forbidden knowledge that imbue you with an abiding magical ability. At 2nd level, you gain two eldritch invocations of your choice. When you gain certain warlock levels, you gain additional invocations of your choice, as shown in the Invocations Known column of the Warlock table. A level prerequisite refers to your level in this class. Additionally, when you gain a level in this class, you can choose one of the invocations you know and replace it with another invocation that you could learn at that level.

At 3rd level, your otherworldly patron bestows a gift upon you for your loyal service. You gain one of the following features of your choice.

When you reach a level in this class that grants the Ability Score Improvement feature, you can do one of the following, representing the magic within you flowing in new ways: Replace one cantrip you learned from this class's Pact Magic feature with another cantrip from the warlock spell list OR Replace the option you chose for the Pact Boon feature with one of that feature's other options OR If you're 12th level or higher, replace one spell from your Mystic Arcanum feature with another warlock spell of the same level. If this change makes you ineligible for any of your Eldritch Invocations, you must also replace them now, choosing invocations for which you qualify.

When you reach 4th level, and again at 8th, 12th, 16th, and 19th level, you can increase one ability score of your choice by 2, or you can increase two ability scores of your choice by 1. As normal, you can't increase an ability score above 20 using this feature.

At 11th level, your patron bestows upon you a magical secret called an arcanum. Choose one 6th-level spell from the warlock spell list as this arcanum. You can cast your arcanum spell once without expending a spell slot. You must finish a long rest before you can do so again. At higher levels, you gain more warlock spells of your choice that can be cast in this way: one 7th-level spell at 13th level, one 8th-level spell at 15th level, and one 9th-level spell at 17th level. You regain all uses of your Mystic Arcanum when you finish a long rest.

At 20th level, you can draw on your inner reserve of mystical power while entreating your patron to regain expended spell slots. You can spend 1 minute entreating your patron for aid to regain all your expended spell slots from your Pact Magic feature. Once you regain spell slots with this feature, you must finish a long rest before you can do so again.