FORMATIONS
To help protect weaker casters and lower level players, melee characters (especially tanks like paladins, warriors, and barbarians) may form up in a formation around the party so that monsters cannot reach the more vulnerable players. These formations form a "wall" of sorts around the party.
Melee players with the Tactics skills are able to form "walls" very effectively. Placing a wall of force in the room can help as well. Also, fighting in small rooms or tunnels can also make it easier to form walls.
Someone on the wall must have the tactics skill to organize the wall or it cannot be formed.
Players in the center who are protected by the "wall" will be able to cast freely without getting interrupted. Furthermore, players in the center can also cast healing and defensive spells upon their groupmates in the wall without getting blocked.
Players can also backstab from behind the wall by performing sneak attack "hit and runs" (wariness is also reduced by the distraction of the wall).
Use the place command to indicate where you would like to stand in the party.