Now I'm s9 laughing at those who say its Izanami ripoff which thay is not true. This chapter just made me respect Mayuri even more. Thattimewhenhe mentioned that sword attacks dont work on him and there after trolling Toshiro when he used a his leg to attack, that was damn awesome!
If I remeber correctly Szayel Apollo was defeated the same way, that drug that made you have superhearing man and make you able to listen to listento waves below the audiable range. The question we shoukd be asking all ourselves should be when and how did Mayuri administer that drug, it can't be through Nemu this time.