Tharumagi (pronounced thah-roo-MAH-gee) is a massive, tortoise-like groundshaker that lives in the Cradle. It calls itself the twin brother of Targhizizi, another likewise gigantic creature. The groundshaker rarely converses to smaller creatures, as it considers them to speak and move too quickly to be understandable.
Both Targhizizi and Tharumagi are over 500 feet long. Their rock-like shells are covered in soil, plants, and trees, as they move slowly enough that entire ecosystems have formed on their backs. By and large the groundshakers take no notice of any creatures that live on them, as essentially nothing of that size is capable of harming them. Both groundshakers wander the interior hills and mountains of the Cradle, walking slow, languishing routes for no discernible purpose or aim. Every few hundred years their routes bring them together again, at which point they stop their travels for a year or two to converse and share what they have seen. None know how old Targhizizi and Tharumagi are, and the groundshakers themselves either do not know or don't care to share. The ancient stories of the elves of Hinthial recount that they have been around since long before the first aeroliths were set aloft.
Targhizizi and Tharumagi do not concern themselves with the actions of smaller creatures. They have never attempted to actively harm the few communities of humanoids that remain in the Cradle, but have crushed villages underfoot due to being unaware of their presence. The other groundshakers of the Cradle, the voidborne, leave both Targhizizi and Tharumagi alone - even if they could be harmed, there is no purpose to doing so.
Small cults have formed around the worship of Tharumagi and his sister.