After the text “Speed: Combination of the speed values of all propulsion on the Spacecraft, divided by the Spacecraft’s size.” in the rule Spacecraft, add the following text:

Controller: An organization, the DDA, or any amount of planar entities.

Make the DDA the controller of the DDA Mothership.

Make a new planar entity, Doom Guy.

Make Doom Guy the controller of the Awesome Deathship.

Create a new dynastic rule, titled Space Combat, with the following text:

All DDA Members have a gunnery stat and a piloting stat, both tracked in the GNDT.  DDA Members, with the exception of the DDA Commander, start out with 0s in both stats.  The DDA Commander starts with 20s in both stats.

As a daily action, the DDA Commander may post a story post with the word “Attack” in the title, giving the name of a spacecraft controlled by a planar entity.  The DDA Commander may also authorize the use of the DDA Mothership.  Players may post comments on that post to join the battle, specifying what DDA spacecraft they are using and whether they are the gunner or the pilot.  For each spacecraft, there may be one pilot and gunner per spacecraft.  Once there are at least two comments on that post, the DDA Commander may start combat between the DDA spacecraft(s) and the planar entity controlled spacecraft.

A new story post is created by the DDA Commander for the purpose of combat. Players in the battle may comment on that post with their actions.  Gunners may fire at the enemy spacecraft, either to subdue the target or to destroy it.  Pilots may decide to retreat or stay.  Once all players in the battle have posted, the DDA Commander may roll for their actions and the planar entity’s action. 

When a pilot retreats, their spacecraft is immediately out of the battle.

Firing at a spacecraft is resolved by first rolling DICEX, where X is 500 minus the size of the target spacecraft plus the armor and speed of the target spacecraft minus the power of the firing spacecraft minus the gunnery of the firing gunner plus the piloting of the defending pilot.  If the result is less than 50, the attack hits.  If a shot to subdue hits, then DICE6 is rolled, and on a result of 1 or 2, the target spacecraft is subdued.  It becomes a DDA spacecraft.  DICE6 is rolled for each piece of spacecraft equipment on the subdued spacecraft, and on a result of 1, that piece of equipment is destroyed.

If the hitting shot was meant to destroy the target spacecraft, then DICE6 is rolled.  On a 1, the spacecraft is destroyed and removed from the Spacecraft Register, but one piece of spacecraft equipment (selected by the DDA Commander) is salvagable and is not destroyed.  That piece of equipment may be added on to any DDA Spacecraft.  On a 2 or 3, the target spacecraft is destroyed, and nothing is salvagable.

Any Planar Entities on a destroyed spacecraft are removed from the Planar Entities wiki page.  Any SE on a destroyed spacecraft is lost forever, unless the rules say so.  Any Planar Entities on a subdued spacecraft are contained.  Any DDA Members on a destroyed spacecraft lose all their energy.

The gunner who fires the shot that destroys or subdues a ship gets 1 point of gunnery.  The pilot on that gunner’s ship gets one point of piloting.

Create a new dynastic rule, titled Keeping It Going:

The DDA Commander may create planar entities, spacecraft, and spacecraft equipment at any time, and may modify any planar entity, spacecraft, or spacecraft equipment the DDA Commander feels has a loophole or major problem.

Yes, this is complex.  But I make the mess of rolls.