Aizen uses Hadō #90 Kurohitsugi

Incantation Hadō #90 Kurohitsugi: . “Seeping crest of turbidity. Arrogant vessel of lunacy! Boil forth and deny! Grow numb and flicker! Disrupt sleep! Crawling queen of iron! Eternally self-destructing doll of mud! Unite! Repulse! Fill with soil and know your own powerlessness!“