Despite being called the “Door of Horror”, many creatures from the plane aren’t nearly as horrible or as evil as they first appear.
The hellmouth is the exception to the rule and it is every bit as nasty as its first impression gives off.
An ambush creature, the hellmouth will wait until its prey is weak before opening underneath them. This is because while the creature can manifest along any surface wide enough to accommodate it, its movement is extremely slow. It also tends to open up along the ground and let gravity assist its predatory needs as the creature is restricted to biting and it can’t move out very far.
Once the hellmouth has settled on a target it will continue to slowly pursue it for as long as it has to in order to catch it. This can take months or years due to the slow speed at which it moves. Counter-attacking the hellmouth is difficult since it is simply not vulnerable until it manifests, and it doesn’t need to manifest until it wants to strike.
Fortunately for human prey, a bed is enough to avoid the hellmouth since while large it’s not capable — nor does it want to — consume the bed along with its occupant. Unfortunately it can make getting out of bed a frightening affair as one must move quickly lest the ground give way.
One interesting element about the hellmouth is that it will never attempt to ingest prey who have had coitus within the past 24 hrs, and this is due to the fact that Horror type monsters are vulnerable the Horny type. In the case of the hellmouth, sexual fluids from the partner act as a toxin and the hellmouth must wait for these fluids to be processed by its prey’s body before it can safely ingest it.
Type: Horror
Strong Vs:
- Cute
- Anger
Weak Vs:
- Horny
- Stupid
Original SA Post: Well you summoned a Hell Mouth. From the Door of Horror.
Fortunately (well for us) it only wants to eat you the moment you are weak.
Good luck!
https://forums.somethingawful.com/showthread.php?threadid=3982062&pagenumber=2
