Prerequisite caster level and Orange Prism Ioun Stone

[Undone]

Does the Orange prism ioun stone (+1 caster level) allow you to take some feats/PRC's sooner than normal?

Example
Divine Interference

Spoiler:

You can convert a spell to interfere with an enemy's attack.
Prerequisites: Divine spellcaster, caster level 10th.
Benefit: As an immediate action, when an enemy within 30 feet hits an ally with an attack, you can sacrifice a prepared divine spell or (if you are a spontaneous caster) an unused spell slot and make the enemy reroll the attack roll. The second attack roll takes a penalty equal to the level of the spell you sacrifice. You must sacrifice a spell of 1st-level or higher to use this ability. Whether or not the second attack is successful, you cannot use this effect on the same creature again for 1 day.

Could you take that at 9th?

To my knowledge items give you the ability to take feats if the item bestows a 24 hour or longer permanent stat. (EX 12 Str with a belt of str can take power attack but only use it when he meets the feat prerequisites) Does the Orange prism function the same way.

[FallofCamelot]

No.

Your actual caster level does not increase just the level dependent effects of your spells.

The best way to describe it is with an example.

Say a 9th level wizard had the orange prism ioun stone. He would be able to cast a fireball as if he were a tenth level caster (i.e. a fireball at 10d6 damage not 9d6.)

He does not however count as a 10th level caster. He counts as a 9th level caster with +1 effective caster level.

The ioun stone does not increase the number of spell slots you have or your access to new spells. It only increases the numeric variables based on level within the spells themselves.

[Aureate]

Undone wrote:

Does the Orange prism ioun stone (+1 caster level) allow you to take some feats/PRC's sooner than normal?

Example
Divine Interference** spoiler omitted **

Could you take that at 9th?

To my knowledge items give you the ability to take feats if the item bestows a 24 hour or longer permanent stat. (EX 12 Str with a belt of str can take power attack but only use it when he meets the feat prerequisites) Does the Orange prism function the same way.

No. Because it is not an ability score. (The temp to permanent bonus is specific to ability scores, AFAIK)

prd- Glossary, Ability Score Bonuses wrote:

Permanent Bonuses: Ability bonuses with a duration greater than 1 day actually increase the relevant ability score after 24 hours. Modify all skills and statistics related to that ability. This might cause you to gain skill points, hit points, and other bonuses. These bonuses should be noted separately in case they are removed.

However, I might houserule it to allow it. The item does increase your caster level. And it is bloody expensive. The prism costs 30,000 GP. Expected Wealth by Level at 9th level is 42,000. If a player wanted to use the majority (72%) of his resources to gain early access to gain access to something one level early, I'd allow it. I'd caution the player against it, because there are much better things he could be doing with his money. But I'd still probably allow it if he really wanted to.