You can expect to become KoS eventually. There is a super easy quest in Neriak that you can use to bump your faction back up with the guards though.
http://everquest.allakhazam.com/db/quest.html?quest=159
Also be aware that the residents of the outpost in the Overthere will probably be ready to attack you even when in evil illusion. For me, following Brell Serilis, they would not be friendly even when I cast the faction boosting Alliance line.