A dungeon RPG from Nihon Falcom released on the PC-8801 in 1990 and ported to PC-9801 and FM Towns a year later.

It was remade in 2002 as Dinosaur Resurrection.

Only released in Japan but has some English UI text throughout the game

Ash is the legendary mercenary who is said to return from any battle alive while his allies are defeated. But in this age of peace there is no battlefield for him. Yearning for conflict he is seemingly guided by a white butterfly to Zamhan…a crawling world, in which tragedy gives birth to madness and disorder in the space between life and death, and endless resentment can become the irrelevant words of a distant age. All it can offer is chaos, and then destruction.