Fire domain 7th level spell slot houserule

[Ashenfall]

For a druid taking the fire domain, instead of an animal companion, the 7th level fire domain spell, Elemental Body IV (fire only), seems sort of... useless.

I know it's good, in a pinch, if you run out of wild shapes, but how do the following seem, as houserule alternates to elemental body, for druids taking the fire domain?

- Fire Storm (already a 7th level druid spell - would simply let fire clerics get it as a 7th level domain spell)

- Delayed Blast Fireball (Sor/Wiz 7 - fireball is already on the fire domain list)

[Jaryn Wildmane]

Take a look at the replacement spells from the associated subdomains. Both Ash and Arson (goblins of golarion) replace the 7th lvl slot.

[Ashenfall]

I love the ash subdomain, but I'm not wanting to swap to it, as it would kill my 20 points of fire resistance. Without swapping to that, I can't see justifying disintegrate, even as a houserule.

As for arson, I see that it grants delayed blast fireball, but the domain power is "meh."

Thanks for the idea, though.