Sunstone

Sunstones are an architecturally programmable mineral indigenous to the planet Krypton..

They can like Nth Metal be used to fortify artifacts and were first were introduced through Kryptonian Time Capsules.

Obtained from

 * Kryptonian Time Capsule

Trivia

 * When used to fortify artifacts from the Kryptonian set (Amulet of Rao, Bottled City Soder, Solar Amplifier), these sunstones grant 10% bonus XP.