Picture the Lord of the rings. Everyone is fighting for power, and the one thing everyone wants is the ring. I have a similar idea.
Bring the GECK item into the game randomly, could be ANYWHERE in the core. And it makes the user or faction in control of it very powerful. However there is a limit, it must be brought into a TZ every 3 days or it will disintegrate from that persons control and appear the next day back somewhere in the core, where anyone could stumble upon it, do you use it for evil and take it out during your travels? Or do you activate it and (wipe/do something to the sever (also deleting your character in possession of it)
Remember this item is ever flowing around, changing hands constantly, and in the intermission after a TZ has been won, those 30 seconds to kill the looters/people pissing you off, could be factional chaos over who loots the GECK. It is like a superior currency, and it controls everyone and no one. Do you fight to keep it out of the wrong hands? Do you want it for yourself? Do you want to see what happens when activated? Do you want it for your factions benefit?
It's up to you now.