I am surprised I have to submit this because I thought you guys would have already.
To fight Omega Weapon, put one of your parties (the one you want to fight him with) outside of the chaple (organ room) at the checkpoint.
Have the other party go to the staricase room here there is a rope attached to a bell and a checkpoint. Have them pull the rope, then you'll hear a monster. Go the the checkpoint and swithch fast (your timed).
Have your other party run into the chaple. Omege weapon will standing there.
Run into him and you will initiate combat. Good luck!
P.S. He has many one hit kills for one character and all characters at once.
Also, he is extemely powerful at attacking physical (around 3000 each time)......!
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