Portals and Spawning
In order for spiritual beings to enter the mortal plane easily, they must pass through rips in the planes themselves, caused by greater powers of god or satan. Angels and Demons CAN pass into the mortal plane without a portal, but it takes considerably longer to do, and they are weaker. Meaning most of the early demons will be a bit weaker than normal. but as more and more pour from portals, they will get stronger, as will angels.
Where are they located?
Portals to heaven are always located in sanctiefied places where demons cannot go through normal means. They are always protected by Divine Judges or other classes of angels.
Demonic portals are more numerous and are randomly thrown about. they are usually gaurded by cults of demons and cultists, with a greater demon around larger portals.
How do i take one out?
There are numerous ways. the most common would be guiding a greater angel or demon to a portal, as they can focus their power against the portal. Imbued people granted the power may eventually be able to do this as well. there are various other loopholes and ways, these can be thought up by the DM as long as it isint something like "killing all demons in the area" or something stupid. perhaps reciting a heavenly/demonic phrase?
How many spawn out of them?
Its a very loose number. as a angel/demon can pass through at any time. Generally, more start appearing when a portal is in danger, as their side will rush to defend the breach. The higher goal is to defend their realm, while attempting to destroy the other.
Can i win by closing all portals?
Not at all. Portals actually open on a regular basis. As teehe number of spirits congregates, rips appear as portals. Giving imbued plenty of chances to venture into the realms.
Where do some of the other creatures appear from?
Vampires and Werewolves are products of spirits being encased in humans and changing their hosts to the point of being a whole new race. Therefore, they reproduce sexually *and* by infecting victems. Sexually is obiously too long for them to wait for a boost to numbers, but many are willing to bite a few people for reinforcments. Zombies are the bodies of the dead (as any horror nut knows), so they are in nearly infinite supply, rising due to the spiritual presence being too high. Other creatures are bound to have been stirred by the various spiritual activity