Telaron's Circlet

Also known as the "Circlet of Clarity", the first of these circlets were created by the wizard Telaron as gifts for his most talented students. The circlet is made of polished silver, with several runes and magic symbols expertly etched into the metal. The circlet is then adorned with a single amethyst gemstone in the front. When worn, it allows the wearer to focus his/her thoughts more clearly, improving the wearer's chances of successfully casting a spell, and providing a measure of protection from spells and enchantments against the mind.

One of the most interesting features of the circlet, is its ability to mold its enchantments to fit the spellcasting style of its wearer. However, the wearer only benefits if they have the ability to cast spells.

Pathfinder 2e

Rarity: Rare
Type: Circlet (head slot) Bulk: L
Requirements: Ability to cast Rank 1 spells.
Invested:
+1 Item Bonus to spell DCs, spell attacks, and skill checks made with your primary spellcasting stat.
+1 Item Bonus to Will saves.

d20 / Pathfinder 1e

Rarity: Rare
Type: Circlet (head slot) Weight: 8 ounces
Requirements: Ability to cast 1st-level spells.
Special:
+2 Enhancement Bonus to two stats (INT, WIS, or CHA), based on class
+2 Insight Bonus to Concentration.

AD&D 2e

Rarity: Rare
Type: Circlet (head slot) Weight: 8 ounces
Requirements: Ability to cast 1st-level spells.
Special:
+1 bonus to two stats (INT, WIS, or CHA), based on class
+1 to saves vs. spells and abilities that affect the mind.

Empowered Enchantment

At higher levels, when one of these circlets is found, roll a d20 and add 1/2 the party's level to the roll. On a roll of 25 or higher, the item's bonuses are doubled.