author=Erilex
Those are some interesting theories! However, I wouldn't speculate much on the particular relevance of that healing spell, since the protagonist's skills vary depending on which forms they have equipped. None of the starting forms include that specific spell, its acquired later in the game.

As for the ogre slayer spear, unsealing it to release its true power is a cool idea, I'll probably include something of the sort.

Hm makes most of my vaildation for my theory go up in a cloud of hot air as the spell isn't available always but I guess that's to be expected when you make assumptions on a game like this :D Especially without any story knowledge =P

For the record I still believe that Agdistis is at least somehow acquaintanced or related to Mamoru. It is the perfect excuse for Mamoru to go crazy.... seeing his friend turned demon climb out of hell? I mean come on that would be cool. Especially if he believes or is responsible for it... Naturally he could always be a cocky a**hole and taunt our Protagonist as useless and all that making us go all out even more, but I will not think about that anymore without more proof than some look that he could be up to no good. (He could totally have done it to take over the world... I would. Er scretch that I am way to lazzy to do such a thing.)

Yeah well about the ogre spear.... I was already thinking about how the hero's could make my life difficult for me and the looks of the spear kinda made me assume you intended to make it look like it's sealed.

If you are interested about the theories about special abilities I had for the characters are as follows:
Mamoru:
Typical sword fighter with a second wind ability. He recovers fully once struck down the first time and the second time (I mean after his second wind) he starts throwing around his real power. Sword Dance my ass to oblivion and all that. Counter physical attacks, regeneration or power boost once an ally is struck down, etc.
Hideto:
Unleashes a powerful attack with his spear or unleashes him for a completly new skillset to which you better not bring any Ogre forms. Also gets the ability to weaken incoming magic once his spear is unsealed.
Kotori:
Goes all summoner once she hits a certain amount of HP and can resummon/resurrect her summons. (The pentagrams on her papers made me think that)Or simply bring different summons (could be done easily) she uses at a certain amount of HP or TP gathered. Those summons are enemies you fight in hell and the like.
I also tagged her for the healer at first before I had my idea. (What party does not have a healer? My second idea was Momuro would heal, but that seems unlikely from his looks.)

And on top of all of that shittons of potions. Hero's gotta have potions. Potions for hero's is life. A fight against unpotioned hero's is just wrong. Potions to increase strength, magic, speed, etc for healing and for recovering MP.... all the good stuff.

I wanna be frustrated by all the potions the enemies throw around. That's how a boss should feel against hero's.... that's probably just me though and wouldn't go over well.