Permanent Enhancement to Intelligence

[Greedeye]

Are there any ways to permanently give myself a +5/+6 (or higher) Enhancement bonus to intelligence, without wearing a magic item?

To be clear, i mean permanent. Not repeated castings of fox's cunning or similar abilities.

So far I have found +5 to str, dex or con from transmutation arcane school, +5 to wis from wood arcane school and +6 to cha from a hunter archetype that is permanent if your animal companion is dead, but I cant find similar for intelligence.

[Isaac Zephyr]

Int is a dangerous ability for permanent boosts, mainly because of being tied to skill points. It's a lot of bookwork even with temporary-ish boosts like magic items, where they just have associated skills to prevent the sudden influx of 1-3 × level new skill points.

[Smallfoot]

Greedeye wrote:

Are there any ways to permanently give myself a +5/+6 (or higher) Enhancement bonus to intelligence, without wearing a magic item?

To be clear, i mean permanent. Not repeated castings of fox's cunning or similar abilities.

Not that I'm aware of. Tome of Clear Thought is permanent, but an inherent bonus. Ditto using a wish spell.

[Meirril]

Well, there is one way. It is a real pain in the ass and it centers on using an item, but not wearing it per se.

You acquire 3 Crimson Sphere Ioun Stones, or a single +6 stone (yes, its possible to make them more powerful). Then you implant the stones. Rules found near the bottom of the page. You are using an item, but it is literally impossible to remove them from you without removing the limb they are attached to. Or killing you.