Byleth draws back Aymr before swinging it in a downwards arc. At its sweet spot, the head of the axe, it deals massive knockback and around 30% damage. Any enemy that was shielding will get their shield broken if hit by this attack. However, if the opponent is hit by the shockwave hitbox, they will be launched with comparatively weak knockback and only take 8% damage. Aymr has decent range, covering behind, above, and in front of Byleth. If the player tilts the control stick in the opposite direction that Byleth is facing at the very beginning of the move, Byleth will turn around, causing Aymr to be executed in the opposite direction. If the move is initiated on a platform, Byleth can drop down through it if the player tilts the control stick down during Aymr's startup. This dropdown mechanic allows Byleth to perform possible mix-ups when using this move.
Aymr is very strong, which makes this move one of Byleth's strongest finishers. It also has super armor throughout its startup, which minimizes the chances of the move being interrupted with an attack. However, this move is very predictable due to its long startup and the fact that its timing cannot be altered This means that Byleth would be vulnerable to grabs and counters, or the opponent simply waiting there for the move to end and punishing Byleth.