I've been playing the no-materia playthrough lately and I reached the Materia Keeper Every guide says he has between 7600-8400 HP... however, I just dealt a positive [He healed for over 3500] 5000 [Maximum, if not less than that] to him and he died. Either he bugged and his Cure2's did nothing or his HP was adjusted because I had no Materia equipped.
I've also heard that Seraph Sephiroth's HP is also adjusted based on materia equipped... for instance, he supposedly get's 80,000 for you having KoTR equipped, and another 80,000 if you used it on Jenova... or something like that.
I'm just wonder what other bosses are adjusted based on materia... because so far this game actually seems far easier WITHOUT materia than WITH.
...interesting thing I've found here. It seems after trying to dig aorund on google, I cannot find a shred of this happening regarding Materia Keeper. Can anyone else confirm or explain this? I am 100% certain that I did not do over 6,000... and if my rough adding was right, I'm certain I did less than 5,000.