e9e0c81b_Halo_3_Skulls___Rampancy__Summary
[Skull] Cowbell Skull [Submitter] spartanNO117 [Updated] 10.21.07 [Level] The Ark [Summary] 
The Cowbell skull makes all explosions bigger. It's the third silver skull.
Halo 3 Skulls | Rampancy
Summary