So, next to some of my spells, there's a value that I presume is the required roll needed to save against my spell. I have two spells that have the same save roll requirement (38) but one is in red, and the other is in blue. The only difference I can see is that one requires my target to make a will save, and the other a fortitude save. What gives? Does this color mean anything, or is it just a quick visual cue?