You cannot Persist creatures summoned with reserve feats. I specifically told you this already, but it's still in this handbook for some reason.
Fell Drain doesn't work like that.
Invisible Spell doesn't work like that.
The Living Holocaust is not able to be cast that early. It does not qualify as a small elemental. AKA, it doesn't work like that.
You included a homebrew feat in a handbook? One that you made up yourself specifically for this type of character? WTF?
Player's Guide to Faerun 62:
Metamagic Effect (Su): At 3rd level, an incantatrix can attempt to apply a metamagic feat she possesses to a persistent spell effect that is already in place.
I argue that the reserve Elemental acts as if summoned by a summon monster spell.
The
elemental acts as if summoned by a summon monster spell. However, as described by this exact quote
the elemental was not summoned by a spell. Therefore, it cannot be made persistent because it is not a spell.
Hi Welcome
Fail
Normally I'd appreciate the effort in a handbook, but when one spreads so much misinformation and objectively fails at applying the rules, I cannot do so. You didn't even bother to explain HOW you planned to make your summons useful. The Summon Elemental reserve feat can be great for utility, but how to utilize said utility was completely missed throughout your posts.
I give this handbook an F.