|This build utilizes the strengths of Spirit Breath to create a cheaper, yet still effective Myrrh build.
Myrrh's best boon/bane set is always +Def/-Spd, as Def is what allows her to double enemies on player phase, while her Spd is already low and inconsequential.
Myrrh's weapon Spirit Breath defines her build and direction. Due to it automatically guaranteeing a follow up if you have more than 5 def to the opponent, due to her insanely high base defense and +3 Def on the weapon itself, Myrrh should always run this weapon.
Reposition is a generically powerful assist that allows tankier units to shuffle squishier units behind them. Swap also works.
Bonfire is the skill that Myrrh comes with, and scales well off of her main stat, defense. However, if one wants to ensure a special activation on player phase, Moonbow is also a good choice.
Sturdy Blow 2 provides Myrrh a cheap but effective way to both increase her player phase damage while helping her achieve the def threshold to auto double the enemy with Spirit Breath. If that is unavailable, Armored Blow 3 also works
Vengeful Fighter 3 is the B skill Myrrh comes with, and provides her a strong enemy phase option. Keep it.
Armor March 3 also is native to Myrrh's kit and is a strong option if you are running other armors, giving her almost flying movement. If she is not being run with any armors and Hone/Fortify/Spur/Drive is good, depending on what buffs your team composition wants.
Close Def 3 is the seal of choice to bolster Myrrh's enemy phase, allowing her to be more tanky. Alternately, Heavy Blade 3 provides Myrrh with a better player phase set, allowing her to activate Bonfire most of the time when initiating.