So far there are no rules for falling to the dark side. This is a BIG problem for us right now in our new campaign because we have a character who is a Force Sensitive Exile and runs around with a party of fringers that have been murdering and causing issues. As yet the GM has been scared to try to inflict any kind of mechanic of dark side transgressions since there is nothing yet out for that in the rules.
Do you have any recommendation?