Gekidoyama Mountain

Gekidoyama and the hills surrounding it are cursed by an entity known as Gekami, the "Rage God."
It is said that any who begin to climb the mountain will find themselves drawn in by Gekami's wrath. They will become consumed by his rage, and as they are, the path for them to retreat down the mountain disappears behind them. Once they have reached a certain threshold, crossing through the event horizon as they approach the mountain's summit, the path down vanishes completely. At this point, there comes to be no way back down for them at all. No matter which direction they turn, the only thing that lies before them is the mountain's peak, and with each step, they are only drawn in closer. Once they reach the top, they will encounter the Rage God himself, and their inflamed lungs will split as they unleash a thunderous roar together with him for but a moment before being slain by his bone blade that flickers with all the fire and fury in Hell.
As an interesting side note, the mountain itself is actually a dormant volcano, but it has not ever erupted during any known era.