Holocron

Holocrons, are containers of energy which give Galen Marek force power which makes him level up.

Normal Holocrons
Normal Holocrons give the player 10,000 force power.

Advanced Holocrons
Advanced Holocrons give the player 10,000 force power, and 1 combo, or force ability.

Sith Holocron
Sith Holocrons give the player a temporary power up such as:


 * Unlimited Energy - Give the player unlimited force energy.
 * Invincibility - Makes the player invincible.
 * Drain Health Arua - Creates a drain health field around the player, which slowly kills nearby enemies.

Holocrons in Star Wars universe
They acually contain information the Jedi Order and Sith store within it.

Achievement
There is an "achievement" for the Xbox 360, in which you have to find all the Holocrons. It is called "Holocron Collecter". It is worth 75 Gamerscore.