It’s both that were changed:
Continuing the discussion from Undermine(d) Development Notes:
Aethervision was given a talent that buffs the damage. My original post is correct in this regard, though admittedly I did not include that you need to take a talent to have it be buffed.
What they really need to do at this point is make touch of the magi feel impactful. It used to feel really impactful (thinking of DF here) but since so much damage was moved into the hero talent tree, it now feels pretty weak. Also Arcane Echo is broken in the bad sense – it is not copying everything.