Green Svarpian
As you head down the tunnel, you find yourself in an area almost identical to where you came from. Green is everywhere and there seems to be no going past the endless flexible branches of vegetation. Suddenly some of the green blinks and you're surprised to find a light green svarpian staring at you. 

Hurry! Feed it before it slithers away!

Head back to where you came from
Or, decide you've had enough and return to the Hollow Tree.