The OL I know best used +11 focus duals...
(I am pretty sure he would won't use anything that doesn't glow, as even his top-grade equipment is no less than +4 and he has plenty of D, C, B, and A crystals left to prove it...)
The other OL I know used +5 Dark Screamer with Focus.
The theme seems to be the best overenchanted damage weapon with focus you can find.
One of em carried a no-grade blunt and the other a blunt he gets Mental Aegis from. Both swap em out for stun and then put em away.
Both said damage is your constant companion and stun is an infrequent guest...
Both are lucky as all get-out and thus rich...
If I was picking? Berz Blade with focus... nothing says "DIE!" like hitting em with a really big sword...
Keep a blunt with mental aegis on it. (also has better Matk for the unlucky at overench....)