Amplification Crystals

Twin Crystals, Silver in colour. It is unknown where these crystals originated. They were associated with the cloned individuals "Maulkiller", a genetic experiment by Darth Vader.

If used as secondary focusing crystals these would provide a +2D to damage to a lightsabre, but at the same time would increase the darkside temptation. All rolls against the Dark side points are made as if the character has an extra dark-side point.

The clone created to use these crystals suffered from psychosis and had to be destroyed, It is unknown where the crystals ended up. They may be on Kamino still.

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Source:
Wookieepedia http://starwars.wikia.com/wiki/Amplification
User: Walrus