Since we're going into a boss battle (and it plays into my current strategy) I should probably explain a bit about Omega's charge shot ability.

As described the charge shot gives a damage boost to Omega's next attack and, in my mind at least, works as a sort of multiplier. But the trick is the fact that it gets more powerful the longer he charges it, meaning the effect stacks each time he uses it.

So say his base damage is like 75. Right now he's used charge once but didn't fire, that means the next shot from each revolver will be 75x2 (or 150x2 if he fire both simultaneously). Should he charge again though it will be 75x3 and so and so on.

Basically, the more he uses charge, the more dead he'll make things.