Telkiira

Telkiiras are powerful lore-gems worn by the leaders of the mightiest elf clans. Each telkiira holds the knowledge, skills, and sometimes even a fragment of personality from each of the elves who previously wore it. Only a few of these devices survived the destruction of Myth Drannor and the other fallen elven realms, and most of those that remain are jealously guarded by their houses. At least a few have made their way into the hands of other creatures over the millennia.
When placed on the forehead of an elf, a telkiira confers the following benefits.

• The wearer gains a +4 insight bonus on Will saves.
• The wearer gains a +4 enhancement bonus to Intelligence.
• A telkiira contains 10 ranks in each of four different Intelligence-, Wisdom-, or Charisma-based skills. Among the most common skills available from a telkiira are Decipher Script, Knowledge (arcana), Knowledge (history), and Spellcraft. When making a check involving one of the telkiira's skills, the wearer can use either the device's ranks in that skill or his own, whichever is higher. He uses his own ability modifier for any skill check using the telkiira's ranks.
• A telkiira functions as a spellbook that can hold up to 200 pages of spells. A wizard can 'write' a spell into a telkiira without paying the usual material cost of 25 gp per page, although he still must take the normal time to do so. A telkiira is fully erasable, so its owner can remove spells and replace them with new ones as he sees fit.
• A telkiira can hold up to ten distinct memories, each up to 1 hour in length, with perfect clarity. A wearer who accesses one of these memories experiences it as if she were the person who recorded it. Writing a memory requires 1 full round, regardless of its length. Telkiira often hold important or treasured memories of their previous owners.

Only an elf or a creature with elf blood (a half-elf, for example) can wear a telkiira safely. Any other creature that places the gem on its forehead gains two negative levels and cannot use any of its abilities. These negative levels remain as long as the telkiira is worn and disappear as soon as it is removed.
Telkiiras are often locked to prevent unauthorized elves from enjoying their full benefits. An elf wearing a locked telkiira gains none of the benefits described above except the bonuses to Intelligence and on Will saves. Any member of the house, clan, or family that owns a given telkiira can lock or unlock it as a free action: Any other wearer can attempt a Use Magic Device check or Charisma check (DC 20 for either) to open a locked telkiira. Failure means the wearer must wait until he attains his next level before trying again.
Strong transmutation; CL 20th; Craft Wondrous Item, fox's cunning, protection from spells, limited wish, vision, creator must be an elf; Price 100,000 gp; Cost 50,000 gp + 4,100 XP.
Source: Lost Empires of Faerûn