Shrooms
They say the forest has many secrets. They also say, "Yeargh, nooo! That mushroom just came alive! It's eating meeee! Oh! Oh! Oh no!" And they're right on both counts.
Shrooms may be cute, but they only want to tear you limb from limb. Their armored caps swing up to reveal a giant maw full of glistening teeth with your name on each one. The forest's immune system will come at you from every direction, sending germinators to launch spores at you from afar, or powerful walking colonies to stomp you flat and flood the battlefield with fungi.