All right, I got the game and I need some questions answered desperately.
2) Where can I find better armor?
You likely won't be finding better armor anytime soon
3) I have cleared the first level (it's called "something Palace"). I have talked with one of the Monumentals and unlocked the rest of the realms. When I choose level #2 in the realm with the palace I cleared, it transports me back to the Palace although to another location (near the Phalanx boss I defeated previously). Why is that? Did I miss something or is this the starting place of level #2?
You are in the correct place. It is referred to as level 1-2.
4) I have attempted to access another realms, I believe it's called Stone somthing. A begger is the entrance dealing merchandise. I do not know how to advance here. There are 2 paths. One leads to bridge that's destroyed and the other takes me to a sort of elevator I cannot access.
See the bridge where the guys are throwing rocks? You can get through there. That is the way to go.
5) What is Pure White Tendency/Pure Black Tendency?
This require a LOT of explanation. I wouldn't worry about it right now. One note: If you die in body form in a given world (boletarian palace, stonefang, etc.) you will shift toward black fro that world, which makes it harder. Thus, some people recommend just suiciding in the Nexus in body form.
6) How do I replenish my mana? How do I learn new "miracles" or spells?
You need either an item (spice) to replenish it or a weapon/shield that does so for you. You can get the Crescent Falchion +1 in the beginning of World 4 behind the black phantom skeleton, but it is difficult. You can also get a Fragrant Ring, but I forget where that is.
That's all for know. If I remember anything else, I'll ask you guys again.
Regarding the game, I like it a lot. It's hard, but not in some unfair punishing manner, like some corridor shooters are. I don't really feel punished when I die, because I always die from my mistakes. It's really not timing or knowing perfectly when to use a weapon, when to deflect attacks etc., being careful awards you greatly. It's rare to see a game use this approach and I believe it's a right one for this kind of a RPG.