The Warlock is built from several modular systems. This makes the class highly customizable even before multiclassing or feats.

1st level: Otherworldly Patron

The Warlock chooses a Patron at 1st level.

The Patron grants subclass features at:

1st 6th 10th 14th

The exact abilities depend on the Patron.

1st level: Pact Magic

Pact Magic provides the Warlock's spell slots.

These slots:

  • are few in number;
  • are all the same level at a given Warlock level;
  • automatically increase in level up to 5th;
  • return after a short or long rest.

The Warlock knows a limited number of spells.

Charisma is the casting ability.

2nd level: Eldritch Invocations

Invocations provide modular supernatural abilities.

The Warlock learns more as levels increase.

Some have prerequisites.

Invocations can grant:

  • improved cantrips;
  • at-will spells;
  • additional senses;
  • defensive effects;
  • Pact Boon improvements;
  • social or exploration utility;
  • weapon enhancements.

The ability to replace selected Invocations on level-up gives some long-term flexibility.

3rd level: Pact Boon

The original 2014 Pact Boons are:

  • Pact of the Chain;
  • Pact of the Blade;
  • Pact of the Tome.

Later pre-2024 material adds Pact of the Talisman.

The Boon is not the subclass.

It is another customization system.

11th level onward: Mystic Arcanum

At 11th level, the Warlock gains a 6th-level Mystic Arcanum.

Later levels add:

13th → 7th-level Arcanum 15th → 8th-level Arcanum 17th → 9th-level Arcanum

Each selected Arcanum can normally be cast once without a spell slot and returns after a long rest.

These high-level spells do not use the short-rest Pact Magic slot system.

20th level: Eldritch Master

Eldritch Master lets the Warlock spend time entreating the Patron to restore expended Pact Magic spell slots.

After using the feature, it cannot be used again until after a long rest.

It is a high-level emergency Pact Magic recovery tool.

How the features work together

The Patron provides subclass identity.

Pact Magic creates short-rest burst casting.

Invocations provide repeatable custom abilities.

The Pact Boon defines a second major specialization.

Mystic Arcanum supplies high-level magic outside the normal Pact slot progression.

Eldritch Master provides late-game recovery.

The result is one of the game's most modular classes.