Interesting. The difference, for me, is that the cleric's version
is a fifth-level spell. It gets that +1 DC that Heighten Spell grants. It's not merely a 4th-level spell that costs a 5th-level slot. Flavor-wise I can accept your interpretation, but mechanically it doesn't work for me, because the cleric's version is actually
more powerful than the druid version.I agree and don't think there's really any question about this. Just preparing a
Magic Missile or
Flame Strike in a 9th-level slot doesn't mean it bypasses the
Lesser Globe of Invulnerability or anything else. You gain nothing for prepping a lower-level spell in a higher-level spot (sans-metamagic), save having that spell available if you need that one spell and only that spell, for some reason.Actually, I'd never use
Spell Immunity to protect against damage dealing spells. It
is useless in that situation, as you point out. Instead my clerics use it to protect against spells that provide unique and detrimental effects. vs. a druid,
Poison, vs. a sorc/wizard possibly
Ray of Enfeeblement,
Hold Person,
Dimensional Anchor,
Enervation,
Touch of Idiocy, etc. vs....well, you get the idea. Or if you don't know the caster you're facing, whichever of these that is most damaging to the particular cleric in question.Interesting. I'd never considered this strategy. Make your allies
immune to
fireball and then just start blasting away...
*scribbles in notebook*