The Five Worlds

Your brilliant and brave students walk along a belt of sand. On the left side, through the burnt lands, dark smoke is coming out of an enormous volcano in the far distance. On the opposite side, an ocean roars with its endless surges, and a hideous vortex is whirling down to the abyss. You can feel the humidity in the air is oddly unstable, and you smell the odor of sulphur and fish at the same time. As you keep walking, you start to hear something strange. There are shouts, cries, and the collisions of weapons --- some people are fighting each other!