You gain class features in the Player's Handbook when you reach certain levels in your class. This section offers additional features that you can gain as a warlock. Unlike the features in the Player's Handbook, you don't gain the features here automatically. Consulting with your DM,
you decide whether to gain a feature in this section if you meet the level requirement noted in the feature's description. These features can be selected separately from one another; you can use some, all, or none of them.