Nifl Frostflowers is a Green tome and weapon skill introduced in Fire Emblem Heroes. It adds +3 to the unit's maxmimum Attack stat and boost unit's Attack and Speed depending on how many allies are within two spaces of the user.
Grants Atk+3. During combat, boosts unit's Atk/Spd by number of allies withn 2 spaces × 2. (Maximum bonus of +6 to each stat.)