Specialist systems

[oleg]

Nay, he is talking about systems that are neither Nebulae or Black Hole. You can not "destroy" them nor create a star. Dead end rubbish.

[Perrin]

Ahhh but you can do something IIRC. You could create a blackhole in the special system. (This removes its special status) Then destroy the blackhole and create a star. Around the star you can then create a ring or sphere world.

[Fyron]

You can create a nebula if you want less drastic effects than a black hole.