physicist call

[Dralasite]

How about Implosion for a cool gravity based damage type? Make the ship weigh so much it collapses on itself.

Don't forget about neutron stars, as well. They are stars that didn't quite have enough mass to collapse all the way into black holes, but are still dense (I think the most dense in the universe that we know of). In a tech tree, maybe you can use them as the tech you get before you black holes, etc.