Warlock Subclass is a Warlock feature gained at level 3 in the 2024 SRD. You gain a Warlock subclass of your choice.
You gain a Warlock subclass of your choice. The Fiend Patron subclass is detailed after this class's description. A subclass is a specialization that grants you features at certain Warlock levels. For the rest of your career, you gain each of your subclass's features that are of your Warlock level or lower.