While in reality, the firbolgs were descendants of Othea and Ulutiu, the firbolgs on the Moonshaes considered that Grond carved them from stone and that the dwarves had been the result of the "leftovers" of this process. In the meantime, They might tap into the innate familiarity with the Artificer https://gnome-wizards14691.theisblog.com/28018931/dungeons-and-dragons-elf-names-things-to-know-before-you-buy