Gracefully Flew is an all girls academia for inspiring archers created by Thalia. (Now accepting the non-binary and genderfluid!) They work closely with Artemis' Hunters as a subdivision of mortals who follow her teachings. They are very much under her protection... they just don't have the immortality that comes alongside with it..
They also work somewhat with Build A Sword Workshop for their trick arrows and Deadly Fashion for their armor.
Do not try to touch them even when Thalia is not in the kingdom as the rest of the Castellan Crew will kill you for it.