Do you think Zor'Ka is able to attack invisible Hoax if she is adjacent?
And if invisible Hoax is adjacent to a Voivode, can Zor'Ka hit her?
Magnifire attack is directed against a character (like a normal melee attack), so I think invisible Hoax could be hit only if she's within 3 circles from the first legal target, but she's unaffected if she had to be the first target.