Prepared vs. Known Spells: The D&D Casting Systems

5e has two main ways to interact with your spell list: prepare or know. Understanding the difference matters for which class you play.

Prepared Spellcasters

You have access to a class spell list. Each long rest, you prepare a subset of spells you can cast that day. Tomorrow, you can prepare a different subset.

Classes that prepare:

• Cleric (prepares from full class list).
• Druid (prepares from full class list).
• Paladin (prepares from class list, shorter).
• Wizard (prepares from spellbook, which is a subset of the full list you've accumulated).
• Artificer (prepares from class list).

Number prepared: Spellcasting ability modifier + class level (or half class level, depending on class).

Known Spellcasters

You learn a specific set of spells at level-up. You can cast any of them at any time. Swapping is rare (usually one swap per level-up).

Classes that know:

• Bard (learns new spells at each level).
• Ranger (learns at specific levels).
• Sorcerer (learns at each level).
• Warlock (learns at each level).

Number known: Varies by class. Usually a small number that grows slowly.

Comparison

| Aspect | Prepared | Known | |--------|----------|-------| | Flexibility | High (swap daily) | Low (stuck with picks) | | Analysis paralysis | Can be high | Lower | | Power per slot | Varies | Often higher (picked carefully) | | Adaptability | High | Low | | Bookkeeping | High | Lower |

Why Prepared Is Often Better

• Adapt to situations. Fighting undead tomorrow? Prepare Turn Undead. Social day? Prepare Calm Emotions.
• Access to more spells total. You can cast any of 20+ class spells across the campaign.
• Reduces "bad pick" risk. If you prepare something that doesn't fit, swap tomorrow.

Why Known Is Sometimes Better

• Less decision fatigue. Pick once per level, don't rethink daily.
• Smaller decision space. Easier to play.
• Focused builds. You commit to specific spells and get mastery.

The Hybrid: Wizard

Wizards learn spells into a spellbook, then prepare from the book daily. They have the largest potential list (the whole Wizard list, if you copy enough spells) and the most flexibility.

Wizards also have ritual casting from any spell in their book (prepared or not), which is a third layer of flexibility.

Swapping Known Spells

Known casters get one spell swap per level-up. You can replace a spell you've learned with another of the same level or lower.

Use these swaps to:

• Drop spells that turned out to be bad.
• Pick up spells that work better for your build.
• Respond to campaign shifts (moving to underdark? take darkvision spells).

The Endlessness and Preparation

Our AI Dungeon Master handles both systems:

• Prepared casters: On long rest, you prepare spells. The system applies your choices and lets you cast any prepared spell.
• Known casters: At level-up, you pick spells known. The system locks them in. You can cast any known spell (slot permitting).

For related reads, our spell slots guide, wizard guide, and sorcerer guide cover more.

Final Takeaway

Prepared is flexible. Known is focused. Both work. Pick the system (via class) that fits your playstyle.

Start a character on The Endlessness and see which casting system feels right.