What options are available for Sorcerers (or other spontaneous casters) to increase their daily number of spell slots?

Question

I'm trying to find a hopefully exhaustive list of all of the potential methods for increasing the number of spells per day a Sorcerer (or other spontaneous spellcaster, but I'm mostly interested in Sorcerer) can cast.

In previous editions and other flavours of d20 games there were quite a lot of options, but now in PF2e I can only find the listed options below:

• Ring of Wizardry (restricted to Arcane tradition only)
• Ring of Counterspells (arguable, kindof a spellslot but very limited)
• Staves

Have I missed any? Is there any listed quote or intention as to why spontaneous spell casters get what appears to be so few of them, and even LESS for non-arcane casters? (might be off topic, I admit, but if you're not arcane you get basically staves and that's it?).

I'm not counting Wands or Scrolls or similar "use this and get a specific spell" items as part of this question, as they don't require or benefit you specifically as a spontaneous spell caster.

Answer 1

There's actually quite a few options which grant extra spell slots to spontaneous casters, though most are gated behind specific classes/requirements.

I've also pulled out a few abilities that grant additional spells that aren't wands/scrolls as worth being mentioned for this.

Extra Spell Slots

• Bloodline Breadth 8th-level Sorcerer Archetype Feat

  • Bonus lower-level spell slots

• Candle of Invocation 16th-level Consumable

  • 2 bonus low-level spell slots

• Conscious Spell Specialization 14th-level Psychic Feat

  • Bonus spell slots for conscious mind spells

• Divine Effusion 18th-level Oracle Feat

  • Ignore empty spell slots twice, different levels

• Divine Evolution 4th-level Sorcerer Feat

  • Bonus highest-level spell slot, only harm or heal

• Divine Inspiration 8th-level Spell

  • Recover spent up to 6th-level spell slot

• Greater Vital Evolution 16th-level Sorcerer Feat

  • Ignore empty spell slots twice, different levels

• Master Summoner 6th-level Summoner Feat

  • Split spell slot into two for only summoning/incarnate spells

• Mysterious Breadth 8th-level Oracle Archetype Feat

  • Bonus lower-level spell slots

• Mystery Conduit 20th-level Oracle Feat

  • Unlimited 5th-level or lower spell slots, each increasing curse

• Occult Breadth 8th-level Bard Archetype Feat

  • Bonus lower-level spell slots

• Primal Evolution 4th-level Sorcerer Feat

  • Bonus highest-level spell slot, only summon animal/plant/fungus
  • Or with Greater Physical Evolution 12th-level Feat, any polymorph battle-form spell

• Return to Essence 7th-level Spell

  • Disarm magical lock/trap and recover spent spell slot up to 3rd-level
  • Recover up to 6th-level if cast as a 10th-level spell

• Ring of Wizardry 7th-level Item

  • 2-3 bonus low-level spell slots

• Sepulchral Sublimation 14th-level Reanimator Archetype Feat

  • Destroy undead minion to not spend spell slot
  • Non-duration spells only, only up to half destroyed creature's level

• Spell Battery Familiar Ability

  • One extra low-level spell slot, requires access to 4th-level spells

• Studious Capacity 16th-level Bard Feat

  • Ignore empty spell slot, not highest level

• Umbral Extraction 2nd-level Spell

  • Steal spell slot from other creature

• Wellspring Mage Class Archetype

  • Less spell slots, but often one free spell slot per encounter
  • Initially limited 2x per day, at level 2 it's unlmited

Extra Spells

• Absorb Spell 14th-level Spellmaster Feat

  • Cast a spell that you critically succeeded a save against once within 10 minutes
  • With 18th-level feat Retain Absorbed Spell can cast three times within 1 hour

• Echoing Spell 18th-level Sorcerer Feat

  • Can cast 4th-level, no-duration spells twice over two turns from spell slots

• Loaner Spell 8th-level Rogue Feat

  • Cast one 3rd-level or lower spell loaned from another caster

• Second Chance Spell 18th-level Wizard Feat

  • Cast enchantment spell again on different creature after first critically succeeded save
  • Would need to be a wizard with a spontaneous-casting archetype for this question, but would work there

• Spell Gem 16th-level Lich Feat

  • One extra spell cast without spending spell slot, from a specific list of spells