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This effect fits within the general theme of the Dark Star mod, which has magical weapons alongside the more standard technology-based weapons. In this case, the Mol'Dom Interceptor projects a piece of its rage and hate towards its target, damaging it by sheer force of will. And when this attack destroys a ship, well, you'll see. The effect is set up to work with any r1 heavyinterceptor. It's a pain to set up, though, so if you just want some shiny stuff to play with, try another page on this site. But if you know some SHP and MEX editing, this may be right up your alley.
Instructions
Unzip soul.zip into your Homeworld directory.
Replace the MediumProjectile section of r1.script with:
setFireEvent R1,GS_MediumProjectile,FireSoul.ebg setFireEvent R1,GS_MediumProjectile,FireSoul.ebg setFireEvent R1,GS_MediumProjectile,FireSoul.ebg setFireEvent R1,GS_MediumProjectile,FireSoul.ebg setBulletEffect R1,GS_MediumProjectile,BulletSoul.ebg setBulletEffect R1,GS_MediumProjectile,BulletSoul.ebg setBulletEffect R1,GS_MediumProjectile,BulletSoul.ebg setBulletEffect R1,GS_MediumProjectile,BulletSoul.ebg setHitEvent R1,GS_MediumProjectile,HitSoul.ebg setHitEvent R1,GS_MediumProjectile,HitSoul.ebg setHitEvent R1,GS_MediumProjectile,HitSoul.ebg setHitEvent R1,GS_MediumProjectile,HitSoul.ebg
Now add a mediumProjectile gun to r1\heavyinterceptor.shp Give it a rather high firetime, no lower than 1 or 2 seconds. Of course, you'll have to modify the MEX and add another gunpoint. Place the gunpoint in the center of the model, co-ordinates (0,0,0)
If you are feeling very adventurous, you can look through the EBG files and find all the setMesh() commands. If you make them point to the model of a different ship, you can put a soul cannon on that ship without it looking any stranger than it is supposed to.