As with most bosses in Skies of Arcadia, virtually no backstory is provided in regards to the origins of Tortigar. It can be assumed though that it has been guarding the Blue Moon Crystal deep within Mt. Kazai for some time (much like the bosses that guarded the other Moon Crystals, such as the Rokwyrm). Tortigar may be a deity like creature similar to the Ryuguu turtle.