Is it possible there is more Atherium in the DLC to use with the forge? They hinted at it a bit.

Please use the search function as there are already several threads about this.

I just searched Aetherium and it brought up 20 or so threads...

Have not found any yet, but I believe no.

The answer is "no". It's as likely as finding other snow elves, despite it being hinted that they may exist as well.

@Uriel
I tried that last night and got no results, guess 20 threads were made since then.

There's no other thread specifically about Aetherium or whether more of it exists. Just searched thoroughly. The question has been asked before though, because I remember asking. That's all you get. No other Aetherium has been found.