The particles and gases ejected from a large volcanic eruption.

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Particles and gases ejected from a large volcanic eruption can even block sunlight from reaching the ground, because of the density of the ashes. Hope it helps!

the game was released on september 15, 2015 for microsoft windows and os x, and on july 17, 2016 for linux. fox expressed interest in releasing undertale on other platforms, but was initially unable to port it to nintendo platforms without reprogramming the game due to the engine's lack of support for these platforms.