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For people who have not or have beaten Dot hack GU vol.2 here is my guide to beating god eater and the one sin. Now this is suppose to be the hardest boss in the game or games. The party i would choose for this battle would either be kuhn,atoli, haseo or Kuhn, endrance, haseo. They all especially kuhn must have their sacrament weapons. Kuhn if your at least match or the same level as this boss his attacks thanx to his weapon can do up to 640 damage have beast awaking also. God eater and one sin have alot of hit points and do massive damage to your health. You can use the same tatics for both bosses. each arm has to be attacked with the oppiste element of that arm. so get lei zas and the dark magic attacks. Also the items for when u run out of mp. have kuhn and haseo and if you choose endrance him too attack each arm at the same time. when he starts to attack make haseo go a far away from the boss and use spells and items that do damage. If you choose atoli have her cast spells if u gave her any and heal. For some attacks u might want to waste an attack to get in the air. After his core opens use if u have the ability to do a awakinig at htat time do it also tell endrance if you chose him and kuhn use their most powerful skills and you to use your powerful attacks. When rengeki comes up attack again hopefully still during beast awaking. Next god eater and one sin will shoot a gaiant energy blast at you run away from it or block. Keep reusing these tatics and you should beat him. With god eater attack the core. if one sin attack arms then core.

nice... all i did was attack..... just full out attacked..... then used either beast or demon (forgot wich i used the most) and beat the s**t outa it =]

The fight was really easy...first time around I used Haseo, Endrance and Silabus and just pounded the crud outta it...second time around, I made it more difficult but it was still a cake walk...I used Haseo and after careful thought, Silabus (lol not really) and did it old school way... cool one attacks, other heals

i had to custimize my broad sword to dark and my twin blades to light attack xp