The Cavern of the Slumbering Druid

The forests and dells in this part of the countryside have slowly been sapped of life. The druid who normally cares for the land has been missing for months now and your party of adventurers needs to locate him. Through a knot in an enormous tree lies the caverns that this druid calls home, but as you breech the enormous trunk and start making your way through the winding corridors and maze-like warrens, you're met with foul scorpions and giant carrion beetles. His den has been corrupted. As you fight your way through to his cavern, you find the druid, locked in slumber, his consciousness trapped in the feywild and his domain being corrupted by an evil fey. How will you free him from his slumber?

How would you use this map? What creatures would live in its tunnels? Let me know in the comments below!