Originally posted by =Marcus=:

Please, please, please... May the black core allowes to travel between other players' worlds. It would really be great if each of us has to counteract invasions to our world or our base from other players that came through a special kind of portal. Also, it would be fun to invade others. It'll add more dynamism to the game, since there's no open servers.

As long as there is an option to not allow invaders on my server I’ll be ok with it.