Byleth (SSBU)/Down special

Hitbox visualization showing Byleth's down special, Aymr.

Hitbox visualization showing the super armor of Byleth's down special, Aymr.

Overview

Byleth channels all of his energy into a sluggish but colossally powerful slash at 30% at its highest using the Hero's Relic Aymr. It has super armor during startup, can be reversed, and Byleth can drop through platforms while performing it. Like other "bold" moves (such as Falcon Punch, Warlock Punch, and Hatchet Man), it triggers Special Zoom. When successfully executed, Aymr can break shields in a single hit. When it is used successfully while falling off the battlefield, by an edge, and it hits the battlefield, Byleth will be suspended, ending the fall. Much like the aforementioned "bold" moves, it expectedly has extremely high lag all around in exchange for its power, making it a very risky yet rewarding move mainly used for hard reads, with the only consistent use being in shield break scenarios. Byleth may occasionally yell "A...ymr!" while using this move. When used in the air, Byleth is stalled slightly just before the hitbox comes out. The animation itself is based on Flickering Flower, a combat art learned exclusively by Edelgard once mastering the Emperor class in Three Houses.

Hitboxes

The shockwave hitboxes function like Hand Slap. They will match the ground they impact. Aerial shockwave implies that the axe was planted into a platform as Byleth is airborne.

ID	Part	Rehit rate	Damage	SD	Angle	Angle type	BK	KS	FKV	Set weight	Radius	Bone	Offset			H×	SDI×	T%	Clang	Rebound	Effect	Type	G	A	Sound	Direct	Hit bits	Hit part	Blockable	Reflectable	Absorbable	Flinchless	No GFX	Heedless
Grounded
0	0	0	30.0%	25.0		Standard	60	83	0		5.7	haver	0.0	14.0	1.0	1.0×	1.0×	0%							Aymr Hit		All	All
Grounded shockwave
1	0	0	8.0%	0		Standard	100	30	0		4.5	top	0.0	0.0	0.0	1.8×	1.0×	0%							Kick		All	All
2	0	0	8.0%	0		Standard	100	30	0		4.5	top	0.0	0.0	0.0	1.8×	1.0×	0%							Kick		All	All
3	0	0	8.0%	0		Standard	100	30	0		4.5	top	0.0	0.0	0.0	1.8×	1.0×	0%							Kick		All	All
4	0	0	8.0%	0		Standard	100	30	0		4.5	top	0.0	0.0	0.0	1.8×	1.0×	0%							Kick		All	All
Aerial
0	0	0	25.0%	25.0		Standard	85	78	0		5.7	haver	0.0	14.0	1.0	1.0×	1.0×	0%							Aymr Hit		All	All
Aerial shockwave
1	0	0	6.0%	0		Standard	100	30	0		4.5	top	0.0	0.0	0.0	1.8×	1.0×	0%							Kick		All	All
2	0	0	6.0%	0		Standard	100	30	0		4.5	top	0.0	0.0	0.0	1.8×	1.0×	0%							Kick		All	All
3	0	0	6.0%	0		Standard	100	30	0		4.5	top	0.0	0.0	0.0	1.8×	1.0×	0%							Kick		All	All
4	0	0	6.0%	0		Standard	100	30	0		4.5	top	0.0	0.0	0.0	1.8×	1.0×	0%							Kick		All	All

Timing

The timing implies Aymr doesn't touch the ground. If it does, a shockwave hitbox appears on frames 3-6 after impact.

Hitbox	62-67
Heavy Armor (grounded)	34-63
Interruptible	134
Animation length	144

Lag

Grounded

Legend (1 square = 1 frame)

Lag time

Hitbox

Vulnerable

Armour

Interruptible

Byleth's moveset

Neutral attack (1 · 2 · 3 · inf) · Forward tilt · Up tilt · Down tilt · Dash attack · Forward smash · Up smash · Down smash
Neutral aerial · Forward aerial · Back aerial · Up aerial · Down aerial
Grab · Pummel · Forward throw · Back throw · Up throw · Down throw
Forward roll · Back roll · Spot dodge · Air dodge · Techs
Floor attack (front) · Floor getups (front) · Floor attack (back) · Floor getups (back) · Floor attack (trip) · Floor getups (trip)
Edge attack · Edge getups
Neutral special · Side special · Up special · Down special · Final Smash