Anktithyra's Create Earthmote

After the requisite runes have been etched into hundreds of pitons, a lesser variant of the ancient Netherese spell "Proctiv's Move Mountain". This spell relies on the numerous pitons to lock the resulting island into place, suspending the structure together and connecting the wild core to the intended enchantment. The resulting island can float in the air but remains unable to move under it's own power, requiring additional spells or sails to move. The Wild magic core is volatile and not easily contained, and destruction of the core will result in the spell's failure and the island submitting to gravity. The resulting island created is no larger than 1000 meters across in diameter, and up to 200 meters deep. Any structures already present inside the spell when it is cast is unharmed by the casting, unless they extend beyond the range of the spell, which ensures a violent separation.