@ SerratedBiz
Like the setting? I bloody love the setting.
There goes what little social life i had left after that fiasco, sob sob. I'll download it so i can give it a spin after finishing with Shin Megami Tensei II, nya.
@ The Wizard
Its
Kuroi Neko teaches darke magicks, nya! bonus time, yay! Aren't you happy? Of course you are!
To begin with, while usually they are used as meaning the same thingie, in the occult the terms Invocation and Evocation are used to describe two very different concepts. The later one, Evocation, is what we do, in a very romanticed fashion, in the Shin Megami Tensei games, sumoning an entity to have a chat and ask thingies and stuff. The former one, Invocation, is the one you do in the Persona games: To become fully or partially possesed by an entity, concept, or archetype in order to gain part of its power, knowledge, mindset, and insight. The lesser varieties of Invocation actually do little more than changing the Witch's mindset, attitude, personality, and stuff to that of the summoned thingie, so that you may win diferent perspectives of thingies, or the kind of attitude you need to do something you want or need but lack the personality or mindset to be able to do, or stuff.
So, for example, if your boyfriend is a retard who acts like you are a thingie and you lack the kind of frontal, direct personality to put him on his place you do a lesser archetypal summoning of, like, Lilith or Babalon or Morrigan or something and either put him in his bloody place or go ax crazy on his butt, depending on the Lady's mood and how much of a jerk he is to her. Though summoning any of those in such a situation i would bet would end in bloody murder. But to go beyond personality changes and subconsious insight and resonance fields or stuff the sorceress needs to actually do a full invocation, becoming partially or completely possesed by the entity-thingie. It is not the safest branch of the occult.
That's the theory, leaving completely aside belief, or lack of belief, in such thingies. In that regard the Persona games are pretty well researched and stuff, but then most of the Megami Tensei games have thingies like that, is only that they are romanticed and stuff to make them into cool games so they aren't always noticeable. For example, one of the most common methods to catalogue invocable archetypes, structures, symbols, concepts, and entities is to group them in the Tarot Card whose symbolic and psychological meaning is the closest to the thingie's resonance and inclinations, kind of like how each demon in the Ars Goetia has a tarot card and elemental attributions and stuff. You'll recognize that from the Persona games, surely.
Sob sob, i'm feeling geeky and weird and crazy at the same time. Hope it answered the question, though.