mythopoeic
Giving rise to myths; pertaining to the creation of myth.
No other fully historical hero has furnished such a perfect opportunity for the mythopoeic faculty.
Where it comes from
From Hellenistic Ancient Greek μυθοποιία (muthopoiía, “mythopoeia”) + -ic.
Adapted from the Wiktionary entry mythopoeic (CC BY-SA 4.0).