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The disastrous adjective means what is unlucky, unfortunate, fateful, harmful or bad omen. Examples: "it was a fateful comment that caused a stir", 'I don't want another disastrous day which makes me rethink many things', 'punch forced him to give up the fight.
What is fatal is often linked to unfortunate and unlikely events. If a football player to debut with his new team scores a goal against his camp and is expelled, it can be said that he made a disastrous match. Nobody expects to what a moment long awaited, arousing the enthusiasm and expectations, ends badly.
Sometimes, the notion of disastrous is used to describe a day which, for various reasons, becomes an unlucky day. An accident that made dozens of deaths can transform an ordinary Saturday in a fateful day. This does not mean, obviously, that all persons have directly suffered a misfortune on that date, but the magnitude of the tragedy is that the media and the press speaks of this disastrous event.
On the other hand, 'The evil demiurge' is a book written by the French Emil Mihai Cioran (1911-1995). The idea of demiurge belongs to Gnosticism and is bound to an entity that is considered a driving force of the universe, but not necessarily its creator, while Platonism associates the demiurge with the flaw (which is bad or even fatal). For Gnosticism, it is associated with evil.