Defeat Baron in Mar's tomb was a mission in Jak II. After passing the First test of Manhood and the Second Test of Manhood Jak finally gained entrance to the room holding the Precursor Stone. However, before he could take the Stone Baron Praxis interrupted him and tried to take it for himself. The PlayStation 3 and Vita versions of this mission are related to a trophy named "Grin and Baron It", in which after completing this mission you will be rewarded with a silver trophy.