I've seen a lot of people saying that most of the Shards are destroyed, but I can't actually recall any lore evidence for this idea, beyond the vague idea that each Calamity on the Source echoed through the Reflections...
We only know details about the state of the 13th and the 1st, and we know that Nabriales is an Ascian who originated from the 12th, "the fragment world adjoining the Void" (but we don't know anything about the state he left it in...). I can't recall, at this date, reading any details about any of the other Reflections.
I wonder where it's coming from? Telephone game shenanigans where people take the seven Rejoining attempts (AKA Calamities) as having actually destroyed shards rather than just trying to collapse them back into the Source? Because I doubt that's happening: the one shard that has been confirmed destroyed, the 13th (aka the Void), has also been confirmed useless to the Ascians and now unable to Rejoin. It was destroyed by Igeyorhm, due to her outclassing its Warriors of Light so badly that its balance was tipped beyond the point of no return - it was not destroyed as the result of a Rejoining attempt.
It's actively against the Ascians' interests to fully destroy Reflections. They probably wouldn't be employing a strategy that would cause it as a matter of routine - so it's unlikely that initiating attempts at a Rejoining has this effect.
I can't imagine most of the Reflections are in top shape, but neither is the Source, really.
As for what they are, they're parallel dimensions. The Void ironically provides the clearest described example of the nature of Reflections.
Speculating: I wonder if the relative ease of travel from the Void to Eorzea is a direct result of the fact the Void is a destroyed Reflection, or of the fact that its former denizens (now Voidsent) are no longer mortal. It seems like the Warriors of Darkness had to go through a lot to bring themselves to the Source, whereas Voidsent can do it almost by accident. And I can't recall any concrete examples of travellers from other Reflections randomly appearing like Voidsent do, despite there being statistically more of them...
Here is my full lore book transcript on the Void, anyway. It's still our most well-known example of interdimensional travel, even though I'm warning you that the same rules may not apply to other, in-tact Reflections.
We only know details about the state of the 13th and the 1st, and we know that Nabriales is an Ascian who originated from the 12th, "the fragment world adjoining the Void" (but we don't know anything about the state he left it in...). I can't recall, at this date, reading any details about any of the other Reflections.
I wonder where it's coming from? Telephone game shenanigans where people take the seven Rejoining attempts (AKA Calamities) as having actually destroyed shards rather than just trying to collapse them back into the Source? Because I doubt that's happening: the one shard that has been confirmed destroyed, the 13th (aka the Void), has also been confirmed useless to the Ascians and now unable to Rejoin. It was destroyed by Igeyorhm, due to her outclassing its Warriors of Light so badly that its balance was tipped beyond the point of no return - it was not destroyed as the result of a Rejoining attempt.
It's actively against the Ascians' interests to fully destroy Reflections. They probably wouldn't be employing a strategy that would cause it as a matter of routine - so it's unlikely that initiating attempts at a Rejoining has this effect.
I can't imagine most of the Reflections are in top shape, but neither is the Source, really.
As for what they are, they're parallel dimensions. The Void ironically provides the clearest described example of the nature of Reflections.
Speculating: I wonder if the relative ease of travel from the Void to Eorzea is a direct result of the fact the Void is a destroyed Reflection, or of the fact that its former denizens (now Voidsent) are no longer mortal. It seems like the Warriors of Darkness had to go through a lot to bring themselves to the Source, whereas Voidsent can do it almost by accident. And I can't recall any concrete examples of travellers from other Reflections randomly appearing like Voidsent do, despite there being statistically more of them...
Here is my full lore book transcript on the Void, anyway. It's still our most well-known example of interdimensional travel, even though I'm warning you that the same rules may not apply to other, in-tact Reflections.