Esurio

"Esurio was to be your pawn, little one?

Esurio was to devour the Secrets and make Absolutes supreme?

'Ha! Esurio no pawn to little things like you!'

Esurio devour the Secrets and then Esurio devour Absolutes!

Then Esurio rule supreme!"

Esurio is the upcoming antagonist of the Sibling Rivalry crisis - which will be set before the Shadow of Death (likely Book II or III) and establishes the first in-canon union between the Secrets and the Absolutes.