<Snipped quote by Vandy>
For magic... hmmm, we could make mana external energy that mages can manipulate and use and various monsters could have this energy on them too, since they kinda ruined the world?
The DnD monster book is a good idea, but there are cockatrices, goblins, trolls, giants, griffons, slimes, and of course, werewolves. The default races, but it's late and I'd need to look for the really cool monsters.
Basically do you want one big religion or multiple? Monotheistic or Polytheistic? How much power does the church have?
There are a few religions. The main one is the Castian Church which is based off of the Roman Catholic Church and will have around the same amount of power. They worship the Creator and his Son Castus and are headed by the Alm. Other religions include the Nordic pagan religion, Estlam (based on Islam), and the Cult of Pullo which worships the last Sarian Emperor and demons. I only have these basic ideas so far.
I like both your magic and monster suggestions. Mana as an external source of power could work, perhaps depending on the individuals affinity towards magic they are able to manipulate more of the mana around them. I think it would also be a good idea if each person has a certain amount of mana within themselves that they can call upon.
In other news, I have put two more kingdoms on the OP. Now it is time for bed.