Grant vision in a small radius around the portal for players/npcs/tames, but not chests/boxes/barrels/etc. Make the vision work both ways. This would allow the spiritist to exit the portal more safely, but also notify people if they are trying to "spy" on them from the spirit world. The cast time is pretty long on the portal so it wouldn't be a feasible strat for scouting, but bring back some of the safety spiritist's used to have in choosing where to exit the portal.