Testament was released for the PC-88 by Basho House in October 1988. This was Glodia's second game. Released a year before Zavas, and a year after Lyrane.
It was an action game, where you play the role of an archelogist-like character, with a fearsome dragon called Penta Dragon as the Last Boss. It was set in a "Bird's Eye View" perspective, and you used guns, grenades, and such. You could walk in 8 directions (left, left-down, left-up, right, up, down, etc.)