Rainbow Light Gu is a rank three movement Gu. It lets a Gu Master turn into light and escape, and the text calls it the fastest among rank three movement Gu.
On the battle stage in Shang clan city, Bai Ning Bing’s follow-up kick only shatters the flagstone after Wei Yang has already pulled clear. Little Xiao names the Gu as Wei Yang’s rainbow light Gu in that beat, and the light reforms more than fifty meters away across the stage from Fang Yuan and Bai Ning Bing. ch. 266
Effect
Wei Yang states two weaknesses himself: the speed is so fast the Gu Master cannot react in time without lightning thoughts Gu, flash of inspiration Gu, or similar; and primeval essence expenditure is middle-high among rank three Gu. He withholds a third weakness and invites them to guess. Bai Ning Bing names it as the inability to use a strength Gu to raise physical strength, and Wei Yang confirms that body-altering strength Gu make Rainbow light Gu hard to use, raising expenditure drastically or risking failed light transformation that destroys the Gu. He also holds light source Gu, which halves primeval essence expenditure when using light type Gu. ch. 266
Form and rank
It is a rank three Gu whose speed far surpasses many rank four Gu. ch. 266
Owner
Later teaching in Shang clan city names Wei Yang a movement type Gu Master whose core Gu worm is rainbow light Gu. ch. 275 As the core of that set, rainbow light Gu is paired with broadsword light Gu and light source Gu as supports. ch. 288
Strength path conflict
Fang Yuan later asks why rainbow light Gu and position swap Gu require Gu Masters free of strength modifications, and answers that the law of strength interferes with the law of light and the law of space, so strong strength Dao marks can make those Gu fail when used. ch. 292
Chronicle
Connections(20)
0 later connections are veiled.