Designing slayers was fun. They're bloody, brutal, and mean, and their design really bears that out. Their backgrounds (presented here) really reinforce the idea that Slayers don't have a place in society. Whereas Sentinels make excellent guards and heros for the city-states of Rodiel, and Rangers are specialists, guides, foresters, and spies, Slayers live entirely to kill people. They're the Gilgameshes, the larger than life heroes that people really wish would go away until it's time to kill another monster. They generally fight with little armor and with whatever weapons are handy, although when it's time to choose they usually select an impossibly heavy weapon that only people of their calibre can bear to use.
More Slayer backgrounds should be forthcoming, but for now, just take a peek at these. I feel these really help to get a feel for the way Rodiel works. There's nothing wrong with imposing a little bit of setting on your players' characters- it's the easiest way to remind them that their characters are very much a product of their society.
Red-Handed: You are a member of a mystic order of warriors who ritualistically tattoo one hand bright red, an agonizing process that takes days. But your faith in your mysticism allows you to recover one fatigue when you slay an enemy. If you do not consume the flesh of your enemies at the end of every battle, you lose this benefit, as the God of Blood you worship demands this.
Enormous: You are significantly larger than the average man. While your equipment costs half again as much as a normal man, you can carry twice as much on your person.
Motivated: A being of incredible vitality and spirit, you can deplete your fatigue past zero, towards a negative amount equal to your normal fatigue total. However, pushing yourself past your own limis means that you have to sleep an extra hour for each negative point until you have equalized your sleep debt.
Savage: You spit on effeminate and cowardly sorcerers- you know that with your lucky charms and observances of taboos you cannot be harmed by their ways. Your will counts for 1.5x normal when resisting magic- for as long as you follow a stringent and conspicuous taboo.
Demon-limbed: One of your arms is actually a hideous, begrimed demon parasite that's grafted to your chest. It is supernaturally strong and functions as an excellent example of the weapon of your choice of light or medium type. For obvious reasons, you cannot hold anything else in that hand. In addition, the parasite is not entirely under your control, and may decide to do its own thing at inopportune moments.