As the title says, I think Khiona needs a buff. Currently she is less useful than Sartana which is a regular hero. I do not think Khiona needs a serious change, but maybe fast mana or a change to her attack boost. Maybe make her attack boost not reliant on getting hit or spread it to all the allies.
I am not really full of ideas on how to buff her, as you can probably see, so if anyone has some better suggestions feel free to comment and hopefully devs will see it.
I’ve read that hero changes are going to be included in next version of the game so I hope devs are considering or will consider Khiona buff.