I saw this beauty today and I started to wonder why it's normal speed and, although it's way above the average Omega Spear attack, it's not godly. Glitch?
I think there is another Omega Spear that has higher base Attack than normal, although being Normal speed I'm not sure about. I could have sworn I remember one version of MS having copies of normal weapons but with higher stats. My only assumption is that the Omega Spear you're seeing has a completely different ID than the 92 base attack Slow (7) one we're used to seeing. Actually, come to think of it, I could have sworn somewhere in the code there are weapons from level 35 up to 80 with higher base attack than normal.
Mob drops have been updated as well people's inventories will be updated to have the correct Omega Spear. Thanks for your report!