Hello all this might be a stupid question, but in the Valyrian Freehold bookmark is there a even that trigers the Doom to happen and whipe out all Valyria ?
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Nope, you can't build an event that will actually change the shape of the map.
The best you could do would be to make an event which turns all the land in Valyria into ruins, that would basically have the same effect, although the land could later be rehabilitated.