Yearling (Arm.) is a weapon skill in Fire Emblem Heroes. An approximate counterpart to the Steel weapons and El tomes in Heroes; Yearling (Arm.) is possessed by all armored beast units, with the standard armored transformation effect of +2 attack and Distant Counter.
At start of turn, if unit is adjacent to only beast or dragon allies or if unit is not adjacent to any ally, unit transforms (otherwise, unit reverts). If unit transforms, grants Atk+2, and unit can counterattack regardless of foe's range.