It's made out of metal.
It's not, and if it was; more and heavier bolts.
Bronze Colossus is Bronze.
Yes, but we are dealing with a cyclops.
WHAT THE FUCK?
When I first read this I was sure I read "bronze colossus".
That is fucking weird.
Hey, just got here, wanna mention something about bolts vs. Bronze Collossi
Okies, I was once attacked by a Bronze Collosus, during my first truly successful fort. My pop was over 120, and I was pumping out weapons and armor for my danger roomed military.
Long story short, it beat my military to death while laughing. I had no weapons strong enough to take on bronze effectively(or so I thought...) and though, after killing off or maiming most of my war dwarves, it had red-class injuries EVERYWHERE (including a missing arm, a missing forearm on the other side, and lopped off feet at the ankles), it would. Not. Die.
By pure luck, the damn thing fell into a murky pool. I thought this was great, until it started causing cancel spam on my dwarves.
Months go by, and lousy doctoring means that my military was not returning to their posts, but were either still in the hospital, or succumbing to infection. Way lame.
Anyhoo, a minotaur shows up. I figure I'd send what's left of my military out after him. Less than five marksdwarves, and a few raw recruit melee dwarves, who've barely touched the danger room. I flip the kill-switch on them, and they stream out of the fort.* I'm keeping my view centered on the minotaur, to make sure it doesn't flee the map, or if it does, I can at least turn off the kill command so my dwarfs won't stand around outside.
The melee dwarves show up, and get ye olde piss beaten from them. More deaths. After a bit, I wonder where the markdwarves show up, and attempt to melee the Minotaur. They had no bolts. Very peculiar. So, I looked in the combat log for one of them. Apparently, he passed by Collosus pond on it's way, and decided to take some pot-shots.
Then I reach the end of the log. As I recall, it went something like this:
The copper bolt strikes the collosus in the torso and the severed part flies off in an ark!
The fort died a half a year later, due to a siege, not enough traps, and a bed-ridden military. Worse, when winter came, the bronze statue was, of course, destroyed.
To sum up: I once killed a (admittedly weakened) bronze collosus with bolts.
I'm just Saiyan.
*Well, trickle. This was on my old comp, so it ran slow, and there weren't many besides.