well yea the only thigs that wont will happen will be a ban from the login server ... the login server recieves authentification from the client that "everything is fine" one the client side - that means no l2w,other bots or modified dlls. the moded fire.dll (crypted in themida - god i hate that thing QQ) checks the system for all possible modifications ... if everything is fine the login server will let u conect to the game server and if not u will get a ban for XX hours or perma depending on the setup of the server.
I think that the only way to bypass that is to crack the themida protected dll and modify it so it would autnetificate even something would be wrong or make some kind emulator that would send the auth. packets to the login server ... but im not sure that it works this way ... i have to get some info on it ... anyway im not skilled enough to crack the themida encryption or make some sort of auth./packet emulator :| ... could someone confirm me ? :P