Reeva needed a better way to fight with monster because when he got to the tree, his punch barely did anything to it. It also periodically released a wave of mystic energy that he had to deal with. Converting it into Yellow mist and expelling it out was very tiresome.
The tree seemed to know that too and consistently shoved the mystic energy at him. However it also had a side effect, the more it used the power, the more the horn that grew from the tree disappeared.
It's a minor side effect considering that the tree hands thousands of those horns on itself. The countless roll of eyes opened again and Reva needed to expel out the excess mystic power again. However this time there weren't just the eyes that attacked him, there was also a tentacle.
Tow tendril quickly shot at Reeva, if he was a normal human, Reeva would have been protected by such a thing and died. But his body was filled to the brim with mysticism, it stopped right before it could price his skin.