Obliviax Aka Memory Moss (Patreon)

Not a well known creature by any means, but a good one. super easy to paint. make your players fear every bit of moss you use.  here's the link - https://forgottenrealms.fandom.com/wiki/Obliviax

"your rescuers leads you back to the same tree from before. using the key, you step through back into the fey wilds. the druid in broken common calls him self 'Shas'o' he leads you careful deeper into  the woods. 

As you travel, he calls a halt before walking over to some moss... and talking to it. This moss along with others like it suddenly stand and begin striding back from where you came. you look at shas'o who grunts 

"guards... guard door... keep away darkness"  "