Amui's Spark LensEdit
Also known as the Bronze Spark Lens, it was seen in Ultraman Tiga Gaiden, this Spark Lens was used by Daigo's ancient ancestor, Amui, to transform into Tiga without assimilating with the Tiga Statue. Where as the other three were made of marble this one was made entirely of bronze with a red stone on the grip. The markings on the top that resembled Tiga's protecter but were red and resembled tribal markings. The device worked the same way the Dark and Light Spark Lens did, what became of it is unknown as well as it origins as it was just found in the mountains by a warrior who slew a monster. Its design and appearance imply that it is not the original Spark Lens so this device remains riddled with mystery. Unlike Daigo's Spark Lens which was gained by his merger with the Tiga Statue, Amu transformed by channeling the power of Tiga while the statue remained in the pyramid untouched.