i did it without the seraph crown. just max your main roles, have vanille stick poison on him then attack away. heal when necessary and hope he doesn't get the one hit kill on you.

I just tried it again.  EPIC FAIL!!!  It wasnt even orphan it was barthandelus.  Im just going to beat barthandelus with light, fang, and vanille.  Then get my ass whooped by orphan.  Reset my party and paradigns, then go kick his ass.  Maybe that will work.

And fang is my 2nd favorite character too.  Everybody knows who #1 is *coughLightcough*

Try to make Auto-type of items, it makes all the difference for the first minute of the battle. Sprint Shoes give you Auto-Haste, Morale Talisman gives you Auto-Bravery (for Fang) and Blessed Talisman gives you Auto-Faith. I've been using them since early chapter 11, and they've been life savers.

you guys give this fight way too much credit. you don't need to defend against his instant death attack. just stock on phoenix downs. and his ultimate attack doesn't kill you. it just lowers your hp to 50+. just keep diversity on. that's what i did. i hardly changed paradigms.

You can get lucky and never have him target his OHKO move against your party leader, or you can be very unlucky and having constantly target him/her. 

I fall on the second category. Even with 80% Death Resist, he still managed to OHKO my Fang.  

^ eh, he never targeted the main character for me. i don't think he's allowed to? my fight (a conservative ass fight) took 21 minutes, and he never targeted the main character. you might be mistaken, he might have killed your main character by something else.

Nope, Progenitorial Wrath can hit anyone on the party, including your main character. I'm not mistaken, i've seen it a couple of times, plus the official guide also refers to that :P 

Some people get lucky that he doesn't target the Party leader with it, some are unlucky. It's all due to any kind of Death spell in the game being much more akin to a Russian Roulette than an actual Debuff. 

I equipped a 30% Death resistance accessory on me. and He casted death on me like 20 times and I resisted every time.

Lucky.  I just got home from skool.  Ill go do something then ill try it again.  Maybe ill beat him.  Wish me luck!

I beat him. I finally beat that son of a bitch. I loved the ending though. Although it would have been a little better with the japanese song but fuck it, its amazing anyways. I love this game and would give it a 9.8 out of 10.