I'm currently playing in a group that does not have a cleric. Actually the campaign rules that the DM has setup have made it so that clerics are not found in this campaign world. So we have a druid and a bard in the party that makes up or quasi healer. Now I have played in games where there was no magic in the world, so of course there were no clerics, but in a world of magic, have any of you ever played in a game where the cleric is prohibited??