the 5 stars glitch is achieved in the level "I guess we are on the ground now". At the start of the level their are 4 cutesiness where Lord of the Stars is on the transmission screen while fighting the chat invasion fleet one last time in orbit before being forced to retreat to the planets surface. If you kill him once just before all 4 cut seans when the bodies resurrect as do npc characters in halo 3 you will now have 5 Lord of the Stars in the first mission on the ground. Note that if you do this they will slaughter their way through the enemy far easier then the level was meant to be beat, how ever, after the 3rd check point their will only be 1 of him again. Note that if before the 4rth check point you try to kill him to glitch a second him, instead of dying he will only get angry and kill you.