@Thanee:
Summon Monster can
also be dispelled (creature by creature, of course).
And except in unusual circumstances, many encounters WILL be with a creature of the appropriate CR.
OR HIGHER. As Mustrum points out, the BBEG using it on the party's fighter(s) makes forone HECK of a shift in power.
CR of just above half caster level ... is just not good enough, IMO. Maybe CR 2 points below caster level, but the majorproblem there is, 9th level spells you gt at 17th level, so as a 20th level character, you're REALLY getting stuff FIVE CR below caster level. Meh.
@Thorian:
Soryy, but that's not how the Aura works. The damage they
take is what non-tanar'ri within 30'
also take (with a Fortitude save for half):
MM2 said:
Aura of Retribution (Su): This effect is always active in a 30-foot spread centered on the Jovoc. Whenever the creature takes damage form any source, every non-tanar'ri within the area immediately takes an equal amount of damage. A successful Fortitude saving throw (DC 15) halves the damage. (For example, if an opponent deals 12 points of damage to a jovoc, that opponent and every other non-tanar'ri within 30' also immediately take 12 points of damage, or 6 points with a successful fortitude save.) Regardless ofthe source of the damage to the jovoc, the damage dealt to non-tanar'ri by this effect is not subject to negationor reduction because of resistance, immunity, damage reduction, spell resistance, or the like.
Note, especially, that the damage "rebound" happens
in the instant the jovoc is DEALT the damage, not afte the damage resolves. So, yes, if you hit a 1hp jovoc with a 30-point attack, the Aura sends 30hp out to all non-tanar'ri within it's aura ... and
then the hapless jovoc dies.
Which would IMO be partially why these otherwise vanilla-bland, ho-hum "demons" are CR5, to begin with.