Sunday, July 19, 2026

Leaving Spell Slots Empty For Later (A Prepared Spellcaster Hack For Pathfinder)

There is a noted wariness among a lot of Pathfinder players when it comes to prepared spellcasting classes. Wizards, clerics, alchemists, and so on may have the ability to choose from larger lists of total spells, but they have to choose which spells they're putting in which slots, and if they choose the wrong spells, well, then they're screwed. Or so the thought process goes.

However, there's a piece of fine print that a lot of folks miss, or don't really think about. Prepared casters largely have the ability to leave a certain number of spell slots empty when they prepare their spells, and they can then perform a small ritual to fill that slot later, thus providing them some wiggle room to ensure the character can choose the proper spell when they actually need it.

It's a strategy that comes with its own risks, but it's still worth exploring to see if it will work for you.

Magic is all about rules, loves. Twist them until they serve.

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A Little Ace In The Hole


If you read through the description of classes like the wizard, cleric, and alchemist, you'll note in the fine print about their spells that the character may choose to leave spell slots open for the day, essentially acting as blank storage spots. These rules are also repeated in the Magic chapter of the Core Rulebook. At any time before the next time the character prepares their spells, they may go through a smaller version of their spell preparation ritual in order to fill that slot with a spell. Whether it's reading from a spellbook, going through a small religious rite, or breaking out their field laboratory to mix a fresh extract, these small rituals typically don't take more than 5 minutes.

This seems pretty straightforward. As a prepared caster, you are essentially hedging your bets that you might need a specific spell during the coming day that you can't predict, so you're leaving a slot open, and hoping that you have the time to prepare the spell safely. Time is the key, here, because as long as you're in a situation where you can crouch down and do some quick reading, praying, etc., this strategy is perfectly sound. When it isn't sound, though, is realizing that in the middle of combat, or when a trap has gone off and the walls are closing in to crush you, you have the perfect spell to deal with this situation... you just didn't pick it that day!

Ah, balls... I didn't take Commune With Eldritch Horror... it's on my list, though...

The strength of prepared casters is that they have access to a wider variety of spells than spontaneous casters do. Additionally, metamagic feats are more efficient when applied to prepared spells. However, while they might be a Swiss army knife in a lot of ways, the drawback is they can feel cumbersome. This is one strategy that can be quite useful, but it's one that should be done sparingly. Because sometimes you'll have the breathing room you need to memorize the new spell that will save the day... but other times if you can't whip out the solution in the next 6 seconds, it isn't going to matter.

As with everything else, though, it's important to have a varied approach to using magic as a tool... especially if you're a prepared spellcaster.

Consider checking out my older article 3 Advantages of Wands in Pathfinder, for instance. Because wands, potions, and scrolls are great for keeping access to certain spells on-hand that will be really powerful in specific situations, but they aren't something you want to keep memorized every day, taking up space in your spell allotment. Additionally, if you're playing a wizard or a cleric (or you're combining the two for a Mystic Theurge with 2 aces in the hole) take the bonded item feature for the former, and gain the bonded holy symbol option for the Ecclesitheurge archetype in the Advanced Class Guide. These features allow you to, once per day, immediately cast a spell that you know which is on your class list as if you had prepared it that day, making it a get-out-of-screwed-free card if you have the perfect tool for the job.

Taking a layered approach with a prepared caster can help ensure that you really are prepared for every situation you might come up against. So make sure you've got a variety of tools in your bag, and help get yourself (and your party) through your next adventure!

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