This is a new Minigame that you can play with your friends. To win you have to destroy all Cores of your oppenent. Sounds easy? Its not. You will have to test new tactics and new ideas. You will get a new experience. Test it and you will love it.
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You will download a complete Server!
1.Download it.
2.Unpack it with 7zip or WinRAR.
3.Go into the folder and open the server.properties.
4.Open in your browser: http://www.wieistmeineip.de/
5.Copy your ip into the server.properties under: server-ip=YOURIP
6.Open the Port 25565 for the world (Tutorial: http://praxistipps.chip.de/ports-freigeben-wie-geht-das_28088 )
7.Save and close server.properties . 
8.Start: minecraft_server_15w36c .
9.Everyone can join your Server in Version 15w36c with: YOURIP:25565
10.Have Fun!
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You need Version/Snapshot: 15w36c.
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Thanks to Halbzwilling for thies really cool Texturepack.