NSSB
NSSB (Not So Simple Buildings) adds structures and areas relating to the mobs from Not So Simple Mobs such as ant hills and the portal(s) to Morlendor.
Morlendor
Morlendor is an underground region and is accessible by portals that appear at the surface. Portals spawned by the map generator will be found near Dirt With Grass nodes. Additionally, there is a portal hidden in the labyrinth beneath Junetown.
Leeches
Morlendor hosts one of the most annoying and horrifying creature, a kind of leech. Not much is known about it: its name, its origin in the source code, the way to kill it, how it chooses its prey... all of this is still mystery.
Once it sees you, it gets on your back and cannot be removed. It will follow you through teleportation and even death. It only inflicts little damage but even the best sword cannot hurt it.
There are two ways to get rid of it. By teleporting or dying, it may move to the nearest player around. By falling from a very high point and then teleporting, it may also loose your track. But stay vigilant: it may still be wandering where you left it, only waiting for you to come back!