Etho's system is pretty good, if you haven't tried it already. If you want to go for efficiency as your first priority, try this one by TheSmokingKoala:
There's always a problem with server lag and RS elevators. If you don't mind sacrificing some style, you can get a nearly as good elevator by stacking mine carts and then holding right click while looking up.
Well on one server, two trusted, longtime admins and a newer mod griefed spawn by placing huge balls of water and lava everywhere, then the mod de-OPed everyone and proceeded to flake a sphere of 2 MILLION tnt in spawn, then set it off,which crashed the server multiple times. Somehow, he's still even on the server (though not the two admins).
Me too, coming off hours and hours of branch mining, I still didn't have the iron for a beacon. So, I moved my entire base (I was in a village earlier) and made Docm77's 4-cell farm (standard design, but 4 of them).
I've beaten it twice legitly. The first time, I was decked out in full perfect enchanted diamond armor, bow and sword. That fight was nothing but monotonous. My brother joined me on LAN early on, but just go knocked off the end island and lost a full set of diamond gear.
The second time, my brother and I made a survival world, played only on LAN, and were woefully prepared for the fight. We only had the world for about a week before the battle. Needless to say, I died many times. Somehow, my brother only died once. Anyway, that fight was much more fun than the first one.
Well the best challenge is to create the beacon block. That means you must kill the wither. (Do anything you want to kill him) Well heres some more of a challenge anyway. Kill the Wither with only a bow (Enchanted is fine)
I'm pretty sure that's impossible, considering that at half health the wither becomes immune to arrows (but unable to fly).
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The second time, my brother and I made a survival world, played only on LAN, and were woefully prepared for the fight. We only had the world for about a week before the battle. Needless to say, I died many times. Somehow, my brother only died once. Anyway, that fight was much more fun than the first one.
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