The Catch skull is on the level [b] The Storm. [/b] The effect is it makes EVERYTHING get more grenades. When I mean everything, I mean everything. One day while I was playing I had a flood throw a sticky at me. A STICKY+FLOOD=ldjfhglisudgbslbv

[i][b]ADMIN NOTE:[/b] I've never seen Flood throw grenades, even on Cortana on legendary with the Catch skull on, so I'm not actually sure this is possible.[/i]

I couldn't believe it! Oh well, it only happened [b] once [/b] so I doubt it will ever happen again. Anyways, onto finding the skull.

[b] Step one [/b]
After you get into the first area with the two Wraiths (one normal, one Anti-Air) kill all enemy infantry.

[b] Step two [/b]
Kill all the ghosts.

[b] Step three [/b]
Kill the brutes in both of the Wraith turrets
[b] !!!!!!WARNING!!!!!! [/b]
Don't kill the wraiths, only their gunners.

[b] Step four [/b]
There is a big pillar to the right of the Anti-Air Wraith, grenade jump onto it OR take the warthog from the begining of the level and sit it next to the pillar. Once it is next to the pillar, jump ontto the pillar.

[b] Step five [/b]
The skull is right in front of you. Unless you don't want the skull, pick it up.

Another 10g=^_^
Happy Skull Hunting!

Also, I probably won't post another skull guide for a couple of days just to let some of you find the skulls on your own. ^_^