The Undead

Not long later, Freidinia was next to the bed inspecting Tryu's sister to see if she could diagnose what exactly was wrong with her. "Master, this is really strange. It's not that she is sick per se, but more of her life force is being drained from her."

"Her life force?" I looked at Freidinia in confusion. I have no idea what could cause such an issue. Who or what could drain someone's life force from them? 

"Yes, her life force has been drained. There are a few possibilities for this kind of occurrence. One is that she has a ghoul worm inside her which is easy to diagnose. They are worms that implant themselves in the upper intestines of a being no matter what race they are and will lay eggs which will then feed off the host's body, draining them of their life force and slowly killing them. These are usually only found near towns that are on the border of places with the undead.