Magnolia...

Magnolia... is an extremely rare war-mode accessory dropped from bosses during the Dimensional Collision event. Whenever it is equipped and a weapon based on music that attacks with projectiles is used to attack, the projectile will explode into a blossom on impact with an enemy, doing no damage but knocking them back an abnormal amount. It will soon start slowly fading, gradually releasing 10-20 petals of an unidentified flower that will immediately seek out an enemy and slam into them, doing 1/16 of the enemy's HP as damage. As such, it is extremely powerful against enemies or bosses with high amounts of defense or health, but is less effective against bosses that have multiple parts or summon allies, such as Skeletron Prime and Ocram.

Stats:

1/16 of Enemy's HP (Petals)