Can a Renegade or Outcast still use his Rites?
Technically? Yes. In practice? It would be a very bad idea for a Disfavored celestial to do that unless he wanted his (former) Superior to find him. Taking Essence from a Rite draws upon the Superior’s Word and Essence reserves – and a Superior who is paying attention will be able to tell where that Essence is going! If the Superior is displeased, he can show up to explain this in person . . . For Rites that “just happen,” such as the Game’s automatic second Essence at sundown, the GM may request that a PC make an Intelligence (or IQ, in GURPS In Nomine) roll to refuse to accept that extra Essence. Or the GM may decide that’s too much bookkeeping and just assume that the Disfavored celestial has rejected his former Master’s Word sufficiently that he is in no danger of “accidentally” using a Rite.