From what I've seen on other threads it doesn't look like it's just slowing hex, but almost any CC, if used as Calico ults, she will be slowed down as if she ulted, but will still be targetable and it will still show her ult animation.
From what I'm seeing Calico ult is one of the very few abilities that can be completely nullified by slowing hex. It is extremely inconsistent with the fact that only 1 other person shares this, every single other movement ability in the game is unaffected.
From what I'm seeing Calico ult is one of the very few abilities that can be completely nullified by slowing hex. It is extremely inconsistent with the fact that only 1 other person shares this, every single other movement ability in the game is unaffected.