Adam3000
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Only reason i say they may have caused it is cuz nobody knows wtf happened that day still, shyt just got real and the entire place went up in smoke
It's implied the Faceless men from Braavos did it
The Valyrians practiced slavery. There was nowhere to escape them because they controlled Valyria and the entire Western half of Essos (Volantis, Myr, Tyrosh, Lys, Andalos, Meereen, etc). But some slaves got out anyway and escaped. The Valyrian Freehold knew they were going to a city called Braavos but, no one could find Braavos' location. It's implied the Faceless Men of Braavos caused the Doom through magic to destroy the Valyrian Freehold once and for all.
I prefer that myth. I just can't see Bran being down with genocide, causing a cataclysmic event that killed millions of Valyrians. It strays too close to the "For The Greater Good" mindset for me
Actually, in "The World of Ice and Fire" it flat out states plain as day that the Faceless Men caused it
It states that the volcanoes of Valyria were being held in check by magicians of Valyria. The Faceless Men killed all those magicians, and with no one to keep them in check, the 14 volcanoes all erupted and destroyed the region