In Halo 2 can you use the skulls in multiplayer mode?

yes u can. when playing through the campaign in halo wars, u will be given a secondary objective that requires u to kill a certain number of a certain unit. if u do this, a circular flare will appear somewhere on the map. that is where the skull is. once collected u can turn them on at the pause menu in game, but if u exit that menu all skulls u activated will stay on until you win, lose or quit. u will also have to turn any skulls u want back on after every mission