A skill granting a critical-hit chance when Donut lands the same attack twice in a row.
Double Tap is a skill Princess Donut gained (at +3) from the Enchanted Anklet of the Fallen Oak. It gives a chance to deal critical damage on the second of two identical attacks landed in a row — a useful damage boost for her repeated Magic Missile barrages.
A critical-hit skill augmenting Donut's repeat-attack damage.