When a summoner with greater eldritch heritage(abyssal[added summoning]) summons fiendish/ demon monsters with summon monster spell-like ability, does he summon double the amount? How about the eidolon(see quotes)? And with the summon eidolon spell?
I'm asking because augment summoning, which specificly applies to summon spells, applies also to the summon monster ability of the summoner.
quotes:
Starting at 1st level, a summoner can cast summon monster I as a spell-like ability...Drawing upon this ability uses up the same power as the summoner uses to call his eidolon.
each creature you conjure with any summon spell gains a +4 enhancement bonus to Strength and Constitution for the duration of the spell that summoned it.
Can Augment Summoning also affect monsters summoned through this Spell-Like Ability?
Yes
Added Summonings (Su): At 15th level, whenever you summon a creature with the demon subtype or the fiendish template using a summon monster spell, you summon one additional creature of the same kind.
Treat this as if you had summoned your eidolon normally, except that it only remains with you for the duration of this spell.
Emphasis mine.
PD
1. Yes.
2. No. Summoning an eidolon "normally" is using the 1 minute ritual. Summon Eidolon is also not a "summon monster spell" (a spell with "summon monster" in the name), regardless of whether it's a spell or SLA.
2. Then why does "summon nature's ally" work? It doesn't have "summon monster" in its name!
Augment Summoning works with Summon Nature's Ally because it only specifies "summon" spell, not "summon monster" as the bloodline power does. The bloodline power would not work with Summon Nature's Ally, either.