Olin Gisir

"Hush! Know that we walk in the ruins of the temple of Astaroth, a demon lord of the Abyss. It is said that the demon sleeps here still, seeking to poison the words of those who wander in. Luckily, I know just the spells to ensure that he remains asleep ..."

- Meraera of the Olin Gisiae

Olin Gisir means "secret keeper" in Elven, which is precisely what these scholar-mages are. Elven lifespans are many times those of humans, and this brings along with it secrets that are best left secret.

Background
Olin Gisiae are elite elven or half-elven lorekeepers who take it upon themselves to protect dark secrets and ancient magics from those who would exploit them, making them much like the Cult of the Shattered Peak in that respect.

Class Features

 * Spellcasting: Like most arcane magical prestige classes, Olin Gisiae gain new spells per day, increase caster level, and learn new spells, as if they had gained levels in their previous arcane spellcaster class.
 * Ancient Knowledge: Olin Gisiae gain boosts to their Knowledge (arcana), Knowledge (history), and Use Magic Device checks starting at 1st level and increasing at every third level thereafter (4th, 7th, etc.). Bardic Knowledge checks (if available) are also boosted.
 * Secret: Olin Gisiae learn special secrets starting at 1st level and increasing at every third level thereafter.  An Olin Gisir can learn any secret in the following table for which their Olin Gisir level plus their Intelligence modifier exceeds the number in the left-hand column.  Needless to say, wizards have somewhat of an advantage given they are already dependent on Intelligence for their spellcasting.
 * Signs and Portents: 2nd level Olin Gisiae can cast augury three times a day (caster level = character level).
 * Word of Dispel: 5th level Olin Gisiae can add dispel chaos, dispel evil, or dispel law (their choice) to their 5th level arcane spells. Those who cast spells as a wizard add it to their spellbook; those who cast as sorcerers or bards gain it as a bonus spell.
 * Word of Might: 8th level Olin Gisiae can cast dictum, holy word, or word of chaos to their 7th level arcane spells, in the same fashion as Word of Dispel.