Originally Posted by diogene0

No you can't add a dreadnought if the player plays the mission solo. You should be able to skin a mirror battleship like a dreandhought though.

So if you want a really challenging group matching the level of difficulty of a dreadnought you can make something like:
Battleship 01 + cruiser 01 + fighters 01 at the same coordinates.

This will be a very challenging group, and some players won't be able to do it, it's a fact. So be carefull when you add ennemies, endless tough battles don't make a mission more interesting. If I want to play something really difficult I just queue for infected ground elite - at least the reward is worth it.

So I highly advise you to just skin a regular battleship and to give up about the extreme challenge idea. I won't make your mission better.