Yeah maybe I went a little far. Like I stated, pg 205, combining magical effects. It falls in line with advantage/disadvantage rules as well as resistance/vulnerability. But they seem to always use the worst examples in this edition. I was looking good for a clearer explanation but I think that was in a 4th edition book.
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"The effects of different spells add together while the durations of those spells overlap. The effects of the sam spell cast multi pie times don't combine, however. lnstead, the most potent effect-such as the highest bonus-from those castings applies while their durations overlap."
In mystic:
"Theeffectsofdifferentpsionicdisciplinesadd
togetherwhilethedurationsofthe disciplines
overlap.Likewise,differentoptionsfroma
psionicdisciplinecombineiftheyareactiveat
thesametime.However,aspecificoptionfroma psionicdisciplinedoesn’tcombinewithitselfif
theoptionisusedmultipletimes.Instead,the
mostpotenteffect—usuallydependentonhow
manypsipointswereusedtocreatetheeffect—
applieswhilethedurationsoftheeffects
overlap.
Psionicsandspells areseparateeffects,and
thereforetheirbenefitsanddrawbacksoverlap.
Apsioniceffectthatreproducesaspellisan
exceptiontothisrule."
There is nothing about same damage type don't stack, reach atrack so. The rule is only about the exactly same spell.
So, yes, they stack. And if an ally cast elemental weapon lvl 7th in your soul knife, this will stack to, to +10 to hit and +3d4+7 to damage.
First look you may think is OP, but mystic obly get one attack and need to burn a lvl 3 and 5 spells to get that. I think the RAI idea is to be like rogue, one almost guaranteed hard hit (lower damage than rogue, unless they burn too much resources).
