As with many things, it depends. The divine blessing of Pharasma is more potent, but only against a specific type of enemy. If you don't ever run into undead, then it's not relevant. Mystic Strike is useful against a wider variety of opponents, but is still limited to those vulnerable to magic, so again, if you're not running into many of those opponents, it may not be relevant.
Ultimately, for me, it would come down to which felt more appropriate to the character and the game I was in.
Divine blessing of phrasma or mystic strike. I would be incline to think mystic strike is the better.
Considering that any weapon with a fusion (such as a tactical starknife with a called fusion for 230 cr) provides the same benefit, Mystic Strike is not really useful (IMO) outside of a vesk or other "unarmed strike" character.
We have already faced a few mobs that were dead but not "undead" because it was one form of or another of parasitic infection. I wonder if that will be the theme to this module. Dead but not unholy undead. We have also faced an incorporeal Beast.
I don't think that Starfinder makes a judgement call over what constitutes an "undead" except that it's something that ceased life functions and is still walking around. Parasitic zombies still have the "undead" type, as do cyberzombies, undead that have been animated with technology. If that incorporeal beast used to be a living person, then it, too, is probably classified as undead by Starfinder.
Now, if your GM made the call that ONLY necromantic undead count for the Pharasma feat, then that is his or her prerogative, but the Starfinder system doesn't make it that granular.
Before we started the game while we were making characters i asked him if there would be any undead and if i should have a focus on countering them since i was makingbthe cleric like pc. He said there would be no undead so dont worry about it. <i will ask him again> since we have been running into these dead fleash puppets. So I chose my feats according to what he told me.
I don't think that Starfinder makes a judgement call over what constitutes an "undead" except that it's something that ceased life functions and is still walking around. Parasitic zombies still have the "undead" type, as do cyberzombies, undead that have been animated with technology. If that incorporeal beast used to be a living person, then it, too, is probably classified as undead by Starfinder.Now, if your GM made the call that ONLY necromantic undead count for the Pharasma feat, then that is his or her prerogative, but the Starfinder system doesn't make it that granular.
I'm not going to accuse your GM of lying to you, but perhaps ask him to double check the Type in the creatures' stat blocks. He may explain to you that he makes a distinction in his game between parasite undead and necromancy undead.
If you're doing Dead Suns, I would also point out that Eoxians ARE traditional necromancy-style undead, and they are some central players in the whole AP (whether or not you fight them, they're still there).
