How does ToEE calculate these? I found in the SRD that it should be 10+(spell level)+(caster's appropriate ability modifier), but that doesn't seem to be what ToEE is using. During testing of Flare, I had three Wizards (lvs4, 5, & 20) cast it. The DCs the targets rolled against for the first two were 14. The last was against 17. While the lv20Wiz has 4 more Intelligence (they all started at 18, and I put all of his level ability points into it), his modifier is only +6 to their +4. What am I missing here?
I don't think so. I wasn't even aware that there were foci (either spell-required or in the general "spell-booster" sense) in ToEE. The wizards have all got peasent clothes, a robe or coat, and a basic quarterstaff; nothing else.
No, I mean as a feat. Spell Focus: Evocation or whatever. IIRC, those feats give a +1 to the DC of the save against all spells of that school.