Originally, Aterika'kaal had a somewhat antagonistic relationship with the people living in its territory. At some point, many generations ago, it was given the skull of Dyre Ode in exchange for living more peacefully.
Around the time of Aldominan conquest, it was taught selfishness and gluttony[1] by the yon Vantzon-Estonbergh family. They made a contract in which it was made into Roseroot Hall in return for being fed sacrifices, of those same villagers that once worshipped it.
In Sapodilla's Night Library, Aterika'kaal is damaged when Felix Hollowfield's blue anti-magic radiation hits Lye. As the party slip away through the city streets, the jar breaks and it crawls into view of the party. Lye attempts to bluff that this little plant monster is his familiar Tombo; Virtue accepts this and greets it, but Duvall recognizes it as Aterika'kaal and insists that they will discuss this later.
The party consider neutralizing the Oratorio of Davia Pledge by releasing Aterika'kaal (which wriggles eagerly at the prospect, and is visibly growing) to feed on its energy. This would lead to the two gods competing for each other's energy and coming to an equilibrium, leaving this hex of Sapodilla a tier 4 location, but stable and not spreading. Lye rejects this, as he has dedicated time and resources to trying to fix it, and the others tear into him for being irresponsible and lying about not having taken it. Instead, they end up doing this to Virtue instead.