[Deathstalker]

Don't know if it has been mentioned yet, but fully moddable Wormhole abilities. (example, specific ship sizes to enter, timed opening and closing {opens every X turns etc), one-way, multiple damage types, random exit, slowly closes so that ships must be smaller and smaller to enter, and most interesting: Mass dependent, ie, max tonnage of ships combined to go thru in one turn, or it 'shorts out' for few turns.)