Ninja Gaiden II: The Dark Sword of Chaos (NES) - Act VI
After dueling with Ashtar, Irene will explain that there is a hidden altar. With no time to spare, Ryu must go, while Robert decides to take Irene with him. The start of the stage has flames, gunners, rushing club men, sneaky scythe ninjas, and bats. Go deeper into the cave and serpents will start shooting fire. As you cross some holes, watch for fireballs lurking. Focus your surroundings as sneaky ball bots will come from the ceiling and flames appear at random spots as well. After escaping the cave, Irene and Robert encounter something. The next area has rushing knife men, serpents, eagles, rock men, and iguanas coming from above at random spots. The altar has the next boss, Kelbeross. These twin statues will move around and release acid bubbles. Defeat both of these statues and Robert will explain that Irene has been taken away again.