OK, another tip on the endings! Here we go!
Ending C : Yes...you betrayed Odin
To do this ending is practically easy. When you kill a boss, Odin's Artifact boxes will appear. Choose not to return it to him, his trust in you will reduced by 5.
Keep doing this until his trust drops to 0, and when you exit the dungeon after his trust is 0 you'll eventually meet Freya, who will warn you that if you ever do this again (make Odin lose his trust in you) she'll punish you.
Ok, now you'll get another chance to choose whether you want this ending or not. If you've decided, make his trust (which is now at 1) drop to 0 again.
**Spoiler** (drage the mouse below)
Freya will come to you and take you to a place where she'll fight you AND no matter how much you try, you will NEVER win against her!
Grats, you got killed by Freya and it's a gameover...
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Ending B : Ok, the war of gods...let it begins
Play as you want to play, don't let Odin's trust drop below 50 for the rest of the game, send an Einherjar to Freya (every or almost every) chapter, the game will eventually make your final dungeon to be the Icy Palace "Jotunheim" where you will fight Surt, the king of giants.
**Spoiler**
Surt will try to tell you that the one who started the war was Odin, but Valkyrie won't listen and she will finish Surt off.
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Ending A : That's the truth! (Do this to unlock the real prologue)
Start off carefully
- don't go to the small meadow, encounter Lucian in Jeravellan, or meet
Brahms until chapter 4
- don't take off the Nibelungen Ring yet
- keep a relatively high Trust of Odin
1. As soon as Chapter 4 starts, send up a person who meet Freya's
requirements. This should get your Seal Rating to about 100.
2. Now, without going to any other events, do the following:
- visit the small meadow: -15
- meet Lucian in Jeravellan: -15
- meet Brahms, choose not to fight: -15
- Defeat Lezard in his castle: -15
These four events, plus doing any other side events, will make your Seal Rating plummet from around 100 to about 41. Now take off the Nibelungen Ring before the Sacred Phase (and take it off prior to other Sacred Phases from now on). The ring does give you 50% against "Dark" so it's a useful accessory otherwise.
3. When Chapter 5 starts, go recruit Mystina and Lucian for your party. Mystina will take off -15, and Lucian -18 from your Seal Rating. Doing about 3 side events will take off -6. And if you took the Nibelungen Ring off before the Sacred Phase, that's another -2. At this point, your Seal Rating should be hovering around 1 point or so.
Now send Lucian up. This will boost your Seal Rating, but since the goal is to keep it below 37(?) and since sending people up nets you a +12 it shouldn't be a problem.
4. Now, when Chapter 6 ends, if your Seal Rating is below 37(?) then you should see an event during the Sacred Phase with Lucian (Freya and Loki will be talking). Witnessing this event is THE KEY to getting the good ending. (In other words, if you don't get this event - you blew it

)
After this it won't matter what your Seal Rating is, so you can send people up to Valhalla if you want. But remember to still keep your Estimated Odin's trust above 40 before the end of the game.
5. When Chapter 8 starts, press start and it should tell you to go to the small meadow. But before you go, it may be a good idea to visit other dungeons to collect items and boost your levels. As you'll soon enter the last dungeon of the game.
I'll give this no spoiler, it's a very very long typing

Do it and see for yourself, it's worth it in someway.
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Edit :
:!: About Lenneth's Niberlung Valesti, the lv 3 one require her to wear the Nibelungen Ring too.