Here is my conversion for the Diabolic domain presented in Fiendish Codex II. As I am not a fan of "Subdomains", many of my conversions borrow abilities from subdomains (for this one, it was the Devil subdomain).
DIABOLIC
Hell's Corruption (Su): At 1st level, you can cause a creature to become more susceptible to corruption as a melee touch attack. Creatures touched take a –2 penalty on all saving throws and must roll all opposed skill checks twice, taking the worse result. This effect lasts for a number of rounds equal to 1/2 your cleric level (minimum 1). You can use this ability for a number of times per day equal to 3 + your Wisdom modifier.
Diabolic Aura (Su): At 8th level, you can emit a 30-foot aura for a number of rounds per day equal to your cleric level. All enemies within this aura suffer a -2 penalty to their Will saves against compulsions and mind-affecting effects. This penalty increases by 1 for every four cleric levels you possess beyond 8th. At 14th level, the aura acts as a targeted dispel magic to all enemies but only affects spells and effects that protect them from being influenced by compulsions or mind-affecting effects (such as from the protection from evil spell). These rounds do not need to be consecutive.