http://wiki.project1999.com/Indigo_Brotherhood
the wiki is awful in places but always improving... for faction its solid, take a peek. Looks like the quests to raise it are all from the warrior guild itself, which is a shame - and short of murdering slaves in CB or leveling and killing Kelethin guards it's a long long road back.
afaik an illusion isn't going to save you if you killed many orcs
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