Shieldblock

Shield Block Snippit by Xrakisis

act_obj.c
put this in void wear_obj
  if (CAN_WEAR(obj, ITEM_WEAR_SHIELD))
  {
    if (!remove_obj(ch, WEAR_SHIELD, fReplace))
      return;

    if (!IS_NPC(ch) && !IS_FORM(ch, ITEM_WEAR_SHIELD))
    {
      send_to_char("You are unable to wear it.\n\r", ch);
      return;
    }
    act("$n equips $p on $s arm.", ch, obj, NULL, TO_ROOM);
    act("You equip $p on your arm.", ch, obj, NULL, TO_CHAR);
    equip_char(ch, obj, WEAR_SHIELD);
    return;
  }

at the top of void wear_obj you will see some shield stuff with 
the WIELD and HOLD stuff. delete this. the above bit of code replaces
it.

act_info.c
replace Off Hand with whatever you want to call a shield
Buckler, Worn as Shield  etc in const   where_name 

fight.c
put this somewhere at the top of the file
bool  check_shieldblock   args (( CHAR_DATA *ch, CHAR_DATA *victim, int dt ));

fight.c:
place: 

      if (check_shieldblock(ch, victim, dt))
	return;

right under
      if (check_parry(ch, victim, dt))
        return;


place this (below), below check dodge function

/*
 * Check for shield block.
 */
bool check_shieldblock(CHAR_DATA * ch, CHAR_DATA * victim, int dt)
{
  OBJ_DATA *obj = NULL;
  int chance = 0;

  if (IS_NPC(victim))
    obj = NULL;
  else
  {
      if ((obj = get_eq_char(victim, WEAR_SHIELD)) == NULL) 
        return FALSE;
  }
  if (!IS_AWAKE(victim))
    return FALSE;
  if (!IS_NPC(ch))
    chance -= (ch->wpn[dt - 1000] * 0.1);
  else
    chance -= (ch->level * 0.2);
  if (!IS_NPC(victim))
    chance += (victim->wpn[0] * 0.5);
  else
    chance += victim->level;

  /* cutting corners */
  if      (chance > 80)  chance = 80;
  else if (chance < 20)  chance = 20;


  /* cutting again */
  if (chance > 90) chance = 90;

  if (number_percent() >= chance)
    return FALSE;
    act("You Shield Block $n's attack.", ch, NULL, victim, TO_VICT);
    act("$N Shield Blocks your attack.", ch, NULL, victim, TO_CHAR);
  return TRUE;
}