Varian glanced around wildly when Jacob teleported out of the way, and then released a half-gasp, half-moan of pain when the arrow took him in the back. He stumbled forwards a few steps before turning around, a mad smile on his lips as his flesh twisted around the arrow and spat it out. The tree monster shuddered, and fell inert, and Varian's appendages shot towards his head, all the mouths forming and unforming on his body letting loose a collective shriek, a thousand different voices as one. The black flesh below his chest started bubbling and expanding, like the froth at the top of a mug of ale, before his lower body was nothing more than a blob of black matter, eyes, and tentacles.
Varian shot towards Jacob once more, this time preemptively lashing out with his many deadly appendages in case Jacob decided to teleport away again.