You have to start from the beginning of the level and when you use the grav lift, it's on the fourth, top, floor in the hallway after the room with all of the exploding crates.
The Cowbell Skull has the effect of making explosions more powerful.
It is some were in the second level ,but if you what to know the exact spot look on youtube.
the cowbell skull, it gives you more bang for your buck, meaning that your grenades have bigger explosions
In Halo: Reach, the Cowbell skull increases the acceleration scale from explosions by 3x. In other words, the radius of the explosion is increased and you'll need to be farther away if you want to avoid receiving damage.
The Ark
No
The first skull on halo 3 is a silver skull. Silver skulls do not award any achievements.
After finding a halo 3 skull, simply pick it up as you would any other weapon.
the primary ones are: iron skull, black eye skull, tough luck skull, catch skull, cloud skull, famine skull, thunderstorm skull, tilt skull, mythic skull and the secondary ones are: blind skull, cowbell skull, gruntbirthday party skull, iwhbyd skull and all of them are accessible from the start so you dont have to look for them. hope i helped :P
once you get a skull in halo 3 you can co to the campain options and turn it on different skulls do different things
13
I believe you are missing the IWHBYD (I Would Have Been Your Daddy) skull. Pudding 101 answer: You get it from the Covenant level after you kill truth. (You have to jump through the rings in the order 4654534)