Getting Muzan's blood in 'Demon Fall' feels like an epic quest in itself! I spent hours grinding and experimenting, and here's what worked for me. First, you gotta reach at least level 50—trust me, anything lower and you'll get wiped out by the higher-tier demons. The Blood Battle event is your best shot; it pops up randomly, so keep an eye on the server announcements. I teamed up with a solid squad of four, all with maxed-out breathing styles, and even then it took us three tries to take down the boss that drops it. The drop rate is brutal, but trading with other players can help if RNG isn't on your side.
One thing I learned the hard way: don’t waste your time on solo runs unless you’re insanely over-leveled. The boss mechanics require coordination, especially the phase where he spams AOE attacks. Some players swear by using Thunder Breathing for its stagger potential, but I found Sun Breathing’s DOT effects more reliable. And hey, if you’re lucky enough to snag it, that blood transforms your character into a powerhouse—totally worth the grind!