巨大な異星人の頭蓋骨が広大なファンタジーの谷に君臨する

A modern fantasy art style illustration of a GIGANTIC Skull of an Alien race that is the size of a mountain that dominates an entire valley. Inside the huge maw of the skull is a secret base of the start alliance. Space ships are entering the huge mouth and landing on the landing pads of the secret base inside the gigantic skull