[Frostmourne27]

For what it's worth, putting up the nexus in an MP game, especially if its a large one, is usually an invitation to suicide-by-mass-murder. It tends to be something of a "look at me - I'm powerful" sign that usually attracts alot of attention, mostly form things like teleporting SCs. If you do put it up, use minimum gems, then recast it a few turns later, using all of your pearls, to give it a bit of dispel resistance. Of course, the reason its so hated is its crazy awesome ownage, and you can ussually do some pretty crazy stuff with all the gems. If you can, try gem wishing alot, to build up magic diversity.