The history of DMC, more or less part 3/8
One year prior to DMC3 in the book Code 2: Vergil:
Vergil: I have not seen Dante in several years. Perhaps this battle will be worth the wait. Time to procure Dante's half of our mother's amulet and unlock the portal to the underworld.
Dante gets his ass handed to him by Vergil.
Vergil: ... Take the amulet, Dante. I will come back for this soon. Put up a better fight next time. This is unacceptable.
Vergil: I have come for my rematch, brother! Levels the whole town with a giant demon tower that functions as a Hellgate.
Dante: Ok, this shouldn't be a problem. Time to beat his ass!
Dante gets his ass handed to him by Vergil... again.
Vergil: ... Am I a joke to you? You had a year to prepare for this battle, and this is it? Foolishness, Dante. Foolishness! Stabs Dante with Rebellion, activating his dormant DT
Dante: See, now you've fucked up. I'm going to kill you.
Vergil: Okay, now I'm motivated! Finally, a real threat!
Another fight happens a few hours later, it's a tie, Vergil falls in a pit and takes his sweet time getting out of it, the Hellgate gets opened by a demon clown, the twins and Lady wreck the clown in two back to back battles, and Dante and Vergil are fighting on a waterfall that is magically at the front entrance to hell, which is in the sky btw. Look, I don't know either lol.
Dante: Bro, why are we even fighting? We're twins! We're supposed to get along! What's your endgame, anyway? Like, what do you want? What are you even gonna do with all this power?
Vergil: Look, either I'm taking the amulet and our father's sword, or I'm taking your life. I don't have all day.
Dante: Oh yea? What else do you have planned?
Vergil: Anything but this. Mostly Murder. Lets fight already.
Vergil finally loses a fight to Dante.
Vergil: Well, time to Yeet off of this waterfall into hell and ruin both of our lives for years to come! Bye Dante! Have fun trying to figure out how to get this magical demon tower to go back into hell and killing all the lesser demons! Also, I need you to basically adopt my unwanted orphan son. Mkay later! Yeets into hell after damn near cutting Dante's hand off with Yamato.
Dante: ... I have so many questions...
Lady: Hey... sorry about you brother. Are you crying?
Dante: Sorry about your dad turning out to be a mom murdering demon clown. Oh, and it's fine. Vergil is dead all the time. Basically, all I do is mourn his loss constantly. And I am not crying! It's just raining, but only on my face. Devil's don't cry. Epiphany moment Oh! I just figured out a name for my demon hunting shop! Thanks, bro! Vergil? Oh, yea... he's dead again.