Rabbit & Steel - Steelheart Solo Lunar - No Loot - Bruiser

Steelheart is a mod that forces you beat the bosses right before their enrage kicks in. You also have no way of getting invulnerability besides taking damage, and you also can't i-frame the final boss' unavoidable attacks. However, one of them won't go through, so you'll still be able to beat Shira, but you must not get hit once during the fight. I unfortunately got hit twice throughout the run, so I'm hoping to get a no hit run done soon.