i don't think there is 'i would of been your daddy' skull.... unless cause of halo 1 the 'i would of been your daddy' level, which is ALSO ON HALO 3 CALLED 'the covernent'... they both take the same island ... as in halo 1 there is the beach which you jump on off a air ship called 'pellician'. that island is the 'covenent' level.... C

The Skull is located in the level, “The Covenant”. After defeating the Scarabs, and going inside, get to the location with all 7 Ring Holograms. You must jump through the rings in a specific order. That order is as follows (1 is at the entrance, 7 is at the end):

4 6 5 4 5 3 4

These rings also produce the notes:

E G F# E F# D E

After jumping through them in this sequence, you will be awarded the “I Would Have Been Your Daddy Skull”. It will be right next to the bridge that brings you over to the Prophet of Truth.