Personally I think a personal (not a zone) silence effect with SR: Yes, Save: Yes, abjuration focus, not evo, if possible, that silences the foe for 1 round per 10 caster levels.
Another alternative would be an 'upper level' version of hammer of the gods and sound burst. A final alternative would be a type of natures balance type spell, offering a bonus/malus to stuff.
A final option; when I get my DnD books back, I'll look up the following complete divine spells for ideas;
7 Blasphemy/Holy Word[1]: Kills, paralyzes, weakens, or dazes nonevil/nongood subjects.
7 Righteous Wrath of the Faithful*: Your allies get bonuses, especially if they worship your deity.
4: Castigate; All creatures whose alignment differs from yours on both the law-chaos and good-evil axes take 1d4 points of damage per caster level (maximum 10d4). All creatures who alignment differs from yours on one component take half damage, and this spell does not deal damage to those who share your alignment.
But, because its a level 7 spell, something like (at 20, capped at 30dx?) 20d8 for diametrically opposite, i.e. LG/CE, 20d6 for opposite on either good/evil or law/chaos, 20d4 for 1 step away, and healing of 1 HP per CL for the same; just in case your LG cleric spams castigate near a paladin
![Wink ;)](./images/smilies/icon_wink.gif)