Trixie vs Celestia! That would be fucking intense!! XD

..but the bitterness in the young one's heart had transformed her into a wicked mare of darkness: Nightmare Moon

an outside factor gave Nightmare Moon her form

No page on Berserk's High Octane Nightmare Fuel can begin without mention of the way that Apostles are made. It starts when somebody that possesses a Behelit hits a moment of absolute despair, where he would do absolutely anything to escape his situation. When this happens, the Behelit, a creepy little egglike thing that has human facial features scattered randomly all over its surface, rearranges those features into a human face. Which then proceeds to bleed from the eyes and start screaming. Then the angles in whichever area this happened start changing and the Godhand, the Big Bads of the series, show up to make the Apostle-to-be an offer. The offer involves sacrificing whoever the Apostle-to-be loves most in order to be reborn as a demon, which is a way of having the Apostle open himself or herself up to evil. Since Behelits invariably activate at the Apostle-to-be's lowest point, that means that this offer sounds very much attractive, particularly if the friend or loved one to be sacrificed was the cause of the Despair Event Horizon in the first place. If the Apostle-to-be accepts the offer, the Godhand mark the person with the Brand of Sacrifice and what happens next is often a truly horrific death as the other Apostles eat him or her alive.

And things only get worse when it comes time for a new Godhand to be born [which Luna definitely has the potential to be], which happens once every 216 years during what is known as the Great Eclipse. A very special Behelit makes its way into the hands of a very special individual. This individual, a charismatic leader of men, achieves great things during his lifetime, but then things start going straight to hell for him, culminating on the day of the Eclipse when he loses all hope and activates his Behelit. When a Behelit of the Godhand activates, the bearer and everyone currently present with him is transported to the Nexus, a nightmarishly surreal place that to mortal eyes is a scene right out of hell itself. Instead of just one or two victims like is the case with Apostles, the Godhand demand that everyone the Godhand-to-be has led be marked for sacrifice in order to become one of their own — and instead of just a good number of monsters, every Apostle in the entire Berserk universe has gathered for the feast, and comes out of the woodwork to eat everyone alive once everyone is marked for sacrifice.