Tree guardian

Shield, green 3, each time another creature dies, adds 1 shield to his abilities.
"Non shall pass!" Said the tree. Then I came
closer, cutting off his limbs. "Non shall pass!"
I cut of his head, burning his body. "Non shall
pass" The sound came from the ground,
grabbing my legs as root sprang from the ashes.
That's when I gave up.
~The unstoppable tree~