Originally Posted by
DevilDraco
I noticed that skills and some spells in the PF2E rules go against an enemies DC rather than having them make a competing roll. However there is no way (that I know of) to have a spell or skill do this. I don't know if you already have plans on setting up a way to do this, but I wanted to point it out in case. :) It seems like a relevant thing that will come into play a LOT especially when it comes to skill checks.
Examples of what I mean:
The Black Tentacles spell attempts to grapple each enemy in the area, it has you make a spell attack roll against their Fortitude DC. If you make a spell attack roll currently, it will always be against their AC, if you set it as a DC then it makes them roll a save against it. However the way this spell is apparently supposed to work is by you making the spell attack roll and having to beat their Fortitude DC which is 10 + their fortitude save.
Regular grapple is a similar situation and requires an athletics check vs. their fortitude DC.
Some relevant pages and sections regarding this sort of thing in case you wanted to look, in the CRB: Grapple is on page 242 in CRB, Black Tentacles is on page 321,
Page 445 where it says Calculating DCs, it makes a point to say that when someone makes a check against a target, instead of rolling against each other, the one competing rolls against a fixed DC of the targets relevant statistic which is 10 + the total mods for that statistic. (Also says this on page 234 near the bottom of Skill Checks and Skill DC's).