How powerful could the children of the eternal emperor become?
They look quite young, especially in the swtor trailers so they could most likely become much much stronger. But how strong?
Arcann stated that Vaylin hadn't even recovered the power she should have after being limited by her father, so judging by that statement she at least should be able to compare to Valkorion himself in her prime. Thexan I won't touch, but Arcann seems to be in his relative prime, however I can see him growing in strength.
Perhaps I remember incorrectly, but IIRC he at least said something along those lines. I'll get the exact quote later.
I'm not saying she will once she gets all her power back, just once she has and later on in her life when she hits her "prime" she might be comparable. I wouldn't say on par or superior, just comparable.