You incorporated your Magecraft-enhanced Cortical Stack into your organic flesh sack, which gathers the vestiges of the lifeblood of the universe and grants you the capability to practice Biomancy.
This allows you to use your own monsters as backup bodies or even infect unsuspecting creatures with a specialised benign tumour acting as a Cortical Stack which allows for transference between bodies. You can also use this to preserve the knowledge and experience of your more precious monsters even after their destruction and then move them into new bodies, as the tumours are extremely durable and can survive outside a body for an extended period of time.
Your skills with Biomancy also enhanced your skills for creating bodies, which allow beneficial mutations even before you inhabit them, and for more rapid body construction as you no longer require highly advanced devices and pods to create and preserve your backups.
Finally, this also synergized with your Blight Craft, as you can create mind, personality, or even soul-affecting diseases and plagues. Creating horrors that should never exist.