[Kefit]

Just handle raid mobs the same as the Drusella and Lucan camps.

Each raid mob is its own camp and can be held as such between spawns. Your guild has to maintain a presence in the camp and clear the trash whenever it pops. Do this for a week uninterrupted and that raid mob is yours whenever it spawns.

Now any guild can get any mob they want, though they'll need to take care to not wipe to a flurry drake that pops at 2am or whatever.