Lower Vel'koz ult base dmg and return the passive stacks to it..
I feel like he's absolute shit in teamfights now and forced into the role of tank shredder, when most games end before he even acquires the items to fulfill his new role since his core build is much more expensive. He feels so off now.
I think they're putting way too much stock in this late game fantasy without realizing that an immobile mage with a handicapped early game doesn't hit that fantasy very often, especially when the core build costs are significantly raised.