[Klashikari]

Looks like I will have to do a summary at this rate
Well, let's see if I can explain a bit in further detail:

Spoiler for end game:

Until I understand her character TIPS, I'm unable to explain much about Walgiria. That said, to explain further the point:
Walgiria was in Rokkenjima as Beato was doing ill stuff with the "endless magic", and even says that her only regret was "passing the beatrice title" to her apprentice.
After a very rough and epic battle, Beato lost, but the latter actually made a trap and Walgiria thus "died" (rather removed from the chessboard).

As result, she is in the "in tea party" and assists Battler despites he cannot admits witches and such. She then explains few things, like the Schrödinger's cat, that permits Battler to expand his thoughts and methods to counter Beato.

After the usual "first 6 sacrifices", few events happen. Eva managed to find the gold, but later her witch self became "The Gold Witch Beatrice" and resumed the rampage of the ressurrection ceremony. At this point, Battler and Beato had a very heated argument, and with a special approach (I won't spoil that though), Battler managed to own completely Beato.

Beato tried to understand what Battler meant by that, but Battler refuses to, and forces her to think about herself and if needed, consulting Walgiria and Ronove. After few psychotic events with Eva-Beatrice, Beato understands some things and begin to act by herself, even if she doesn't have all her powers anymore and her actions are hindering Eva-Beatrice.

After lots of trouble, Eva-Beatrice is finally "invited" in the Tea Party, where she has to fight against Battler, who cannot allow her to taint "beato's name". From there, epic battler of wits, but in the end Eva-Beatrice is the winner, with almighty Red Text, which made Battler surrender completely.

However, Beato then used a method which completely took everyone offguard, and the matter is settled down, at the expense of Beato's existence (Eva-Beatrice vanishes as well).
In the plot, things are "settled", though "plot" Battler is murdered by Eva (who went utterly broken due to George mysterious death). Nanjo is killed by a unknown factor (but claimed to be a murder), while Jessica is dead mysteriously like in ep1 (unfortunately, I don't get her EXECUTE TIPS text). The only survivor is Ushiromiya Eva, confirmed 12 years later. Among Kinzo's relatives, only Eva and Ange (who couldn't come due of her sickness) are alive.

After a while, both beato and Battler were able to reach the Golden Land.
Battler is relieved and such, and unlike before, he is about to sign the golden land registry. This is where Beato reverts to her real self and starts to force Battler in signing "Ushiromiya Battler. I admits witches exist".

Then, Ange intervenes and allows Battler to regains his senses, though he is badly hurt that Beato toyed with his feelings (as he was utterly deceived).



As for Ange, it seems she is "Ange-Beatrice" since Eva is about to die, so the latter gives all the fortune to her (not really in a generous way, but rather as revenge). As result, Ange becomes the fourth Beatrice (if we speculate there isn't anyone before Walgiria), Ange-Beatrice.
Ange wanted to know the truth, but Eva is as broken as Keiichi in tatarigoroshi. As result, Ange ponders about it, and wish to see her beloved parents and brother. This is where Bernkastel appears and asks her help though there isn't any guarantee that she can "bring back her family". She can avenge them, but making them alive would be a probability close to 0.
Ange is actually Bernkastel "Knight" Piece (IIRC), and she will assist Battler in the tea parties, though there isn't any explanation why Bernkastel chosed her, nor her possible powers and such.