rushlight said:Ahh, but there are issues here that are different than the usual "This feat adds +2 that feat adds +3 for a net +5" metamagic feats.
This is all very nice rationalization, but you're wrong. Heighten spell is a metamagic feat. Metamagic feat slot increases are cumulative. Order of operations doesn't matter when combining metamagics.
If you heighten to fourth level, it is a fourth level spell, and you combo that with other metamagics.
Rushlight is correct, that heighten spell is one of the less-useful metamagic feats. I would allow it as the default rule. Cast a 4th level spell in a 5th level slot, get the +1 DC.
Edit:
The wording problem arose in the 3.0 to 3.5 changeover. Before, you could stack like metamagics, so if you wanted to multiply heighten a spell, you could, and the feat was just written as "+1 spell level to raise the effective level 1 step" or something like that.
Now (3.5), since you can't use a metamagic feat multiple times on one spell, they had to rewrite heighten in a way that is apparently open to misinterpretation.
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