Basic attacks on-hit reduce the target's damage dealt by 15% for 3 seconds, refreshing with each hit. Their size is also reduced significantly for the duration.
This augment page for Shrink Ray reflects public Arena Mayhem data for patch 26.19.
Graded against the other augments of its rarity, from all champions' games. The source publishes no per-champion results for augments.
See the Gold tier list