This modifier creates a bright shimmer of sparkles on top of a single marking. It should not extend beyond the range of the marking. It will be the same color as the marking or lighter. It will not have multiple colors in it unless the marking is multi-colored.
Two examples of shimmering.
The shimmering marking still follows its normal rules. It only causes the trait to sparkle.
Modifier, Claw, Leather, and Crest Rules
This only affects one marking on the dragon.
You may have up to three markings affected by shimmer.