Ah I see. I just meant it was a crappy example since it's the only one that talks about multiple elements changing and doesn't show it. Especially since everything else is about single element.
Hehe well prepare to get mind blown. Elemental staffs and obis (well ok this is really day/weather) with right element do as well as Magic dmg stat (though really crappily)
So some testing. Went to do some level 80 Heraldic imps on pld/sch (easy way vary my hit rate from what should be pretty low to capped without increasing dmg while also being highly survivable) and helixes all do the same dmg with the same stats unless resist/sdt and only element they have under 60% is dark at 30%.
In the gear I was in all elements were dealing 42 for full dmg except dark which did 23 (it was dark day so that's why numbers are slightly higher). Take off my ilvl joy toy and resist rate goes thru the roof and got almost all resists at 5, 10, 21 for non dark so no 1/16. For nocto though did 2, 5, 11, 23. So clearly a 1/16
Tried sleep. Actually got full 1 minute duration multiple times so.... yeah no resist or anything. Blind also lasted full 3 minutes when I did it as a sch.
So went back and tried testing out the percentages. No mdmg or affinity or anything. Based on the chart lvl 1 fire should do 57.5% of closing skillchains dmg (115% light *.5). 540 fire led to 310 liquefaction. Yep perfect.
lvl 1 dark should deal 15% of closing skillchains dmg (30%*.5) 16.5% if get day proc. 335 noctohelix gave 50 dmg compression. 15% golden.
So the skillchain dmg thing lines up great but looks like they jumped the gun on the whole guaranteed resist thing though my assumption of sdt as we normally know it (since that is supposed to effect debuffs too. Though who knows maybe we've been wrong all along about that too and they just lined up coincidentally sometimes) was off too. Not large enough sample of mobs etc but -50% dmg to that element that isn't applied to the skillchain though not sure about specific -element dmgs applying I'd assume they would. About only thing I can think of that would defensively effect a nukes dmg but not skillchain would be MDB so maybe try some breaths next and maybe another mob