Fruit of Iðunn is a Red tome and weapon skill introduced in Fire Emblem Heroes as the personal weapon for Tana (Noble and Nimble). It adds +3 to Tana's maximum Speed stat. If Tana is at or below half health; allies within two spaces can move to a position adjacent to her.
Fruit of Iðunn
Grants Spd+3. If unit's HP ≥ 50%, allies within 2 spaces can move to a space adjacent to unit.
In Norse mythology, Iðunn is the goddess associated with apples and youth.