[c0ncrete]

honestly, the only way you can keep the players from knowing where the boss has spawned is to not spawn it immediately, but via script when some sort of criteria is met.

say if a zone had three corridors full of minions, each leading to larger chambers where the boss -could- spawn, you could use the zone's player.pl to pick which of the three areas will have the boss, then have a sub-boss right outside the chamber in question spawn the main boss upon the sub-boss's death. you could use player.pl to randomly select which of the three chambers would spawn the main boss and then send a signal to the appropriate sub-boss.

this way, you don't have to worry about MQ users having an unfair advantage... but on the flip side, trackers won't be able to assist in location of the main boss.