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When a concentration check is made you roll d20 and add your caster level and the ability score modifier used to determine bonus spells of the same type. (quoted)

If I was looking to create a magical item to add a bonus to this, what should be used? This is not a skill check - as there is no skill involved - although to my mind would be the most obvious category for it if such an item could be created.

So is there a way to create a magical item that would give a bonus to this check?

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up vote 10 down vote accepted

Yes, and there are several magic items that do. It's probably best to back-figure from those as the default magic item creation rules don't always give good results for unusual items.

Check out (on the better PFSRD):

  • Gloves of Elvenkind - +5 to Spellcraft and Concentration checks while casting defensively, 7500 gp
  • Fortunate Charm - reroll a skill or Concentration check 1/day, 3000 gp

The gloves of elvenkind are the best compare (in fact, you probably should just use them and move along). Cloak/boots are also +5 skill items for 2500.

Now the gloves do Spellcraft and Concentration, so you have to calculate that using the "two effects on one item" cost - like Gloves of Swimming and Climbing are 6250 gp, which is 2500 (Swim) + 2500 (climb) + 1250 (50% of the second power combo cost).

Therefore the 7500 cost of these gloves is 3750 (Concentration) + 2500 (Spellcraft) + 1250 (50% of the second power combo cost). So Concentration bonuses could be said to be 50% more expensive than a skill bonus (bonus squared x 150 gp). Also, that bonus is only for casting defensively - I would assume that caveat would make a flat "bonus to Concentration checks in all circumstances" much more expensive. I have no basis for this than my opinion, but I'd go bonus squared x 500 gp - it's clearly intended to be less than a stat or save bonus, but more than a skill bonus.

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