The solarian weapon states that it is supernatural which means it is magical. Does that mean the damage counts as magical for things like incorporeal creatures?
[RPG] Does the solarian weapon’s damage count as magical
starfinder
Related Solutions
Weapon Specialization does not appear to allow a choice (which would be with language such as 'you MAY add your character level...'). So yes, you will add your level to any damage done with a weapon you are specialized in, strange as that may seem.
At low levels, not a concern for battlefield medics, but even at higher levels, the amount of healing being delivered will hopefully outweigh the damage being applied. It would certainly appear to be more efficient to just apply medicine by hand, but in combat, you do what you need to survive.
No, it doesn't stack.
As per the SRD or on page 263 of the core rulebook:
If you have damage reduction from more than one source, the two forms of damage reduction do not stack unless the sources granting the damage reduction specifically note otherwise. Instead, you get the benefit of the best damage reduction in a given situation. Rarely, an effect specifies that it increases a creature’s existing damage reduction.
Basically, unless your source of damage reduction explicitly clarifies that it stacks with or improves existing damage reduction, they don't stack; you just get the benefit of whichever one is most useful against a given attack.
Both the Enhanced Resistance feat (at least when choosing kinetic damage) and the Solarian Dark Matter ability offer DR/-, meaning it's not negated by anything and applies to all kinetic damage. The bonus offered by Enhanced Resistance will always be better than the one offered by Dark Matter, so the latter becomes redundant if you have DR from the former.
It is important to note that though the feat offers better DR, it can only be taken once - the feat does not specify that you can take it multiple times and choose a different option, so the powerful resistance it offers can only apply to one kind of damage. Since the Solarian offers you a different, albeit weaker, source of DR, accepting somewhat worse kinetic damage resistance in exchange for pretty good energy resistance could be well worth it.
Best Answer
Yes, they do...
It is in the Supernatural ability very definition:
(Emphasis mine)
This point is further confirmed by the definition of incorporeal creatures:
But
Looking at the Ethereal condition:
An ethereal creature exist on the Ethereal plane and follow the same rules than any other planes about interacting with the Material Plane, with the exceptions above. So wielding a magical sword on the Material Plane do not bother a creature on the Ethereal Plane more than a creature on the Fire Plane, except if this weapon is enchanted with an appropriate Force or Abjuration effect. I think you were referring to Incorporeal creatures, as mentionned above.