The entrance on the surface is held by a Great Seal (タルタスの神殿 Tarutasu no Shinden), created when the Silvites of the Old World imprisoned Yeligar beneath. This seal made entry from the surface impossible. When Vyse, Aika, Fina, and Drachma arrived at the Seal in Valua through North Ocean, they learned that it was indestructible even to the Valuan Empire. However, Vyse and his crew later managed to find an entrance to the Maw in the lower sky on their quest for the Yellow Moon Crystal.