Archer said:
Heighten Spell always needed a boost and now you can have a fortified spell which penetrates SR and has a higher DC save and bypasses globes of invulnerability.
Where in the nine hells did you get THAT silly idea?
Fortify Spell's
only benefit is to give you +2 to SR checks. It does NOT up the ACTUAL level of the spell (any more than Empower does).
A 24 Intelligence, 18th level wizard with no SP/GSP/etc feats, casting a [/i]Fortified (+6) Fireball[/i], will roll 1d20+30 to penetrate SR (18 form caster levels, +12 form Fortify Spell metamagic). The spell required a 9th-level slot to prepare, but is still a 3d level spell
in all ways;
Minor Globe of Invulnerability still works against it, and the save is still that of a 3d level spell (20 for our example wizard).
Fortify spell is a variable-cost Metamagic, whose benefit is a bonus equal to double it's cost. It is
NOT Heighten-spell-with-something-extra. Not even CLOSE.
With that said: the example wizard would probably have been better off using Heighten +3 and Fortify +3 at the same time, resulting in a 6th level spell, cast from a 9th level slot, with a +6 bonus to SR checks.