Affect 2 by Cherun, this file will tell you what to do in order to add a 
affect2 slot to your mud so you can have more spell affects becuase rom2.4b4
rom 2.4b6 and so on only really allow you to add 2 other spell affects to the 
ones already coded in. Ill make this as easy as I can for you newbie coders out there.

Ok first open up your merc.h file

in your /*where definitions*/ part of merc.h
it looks like this
#define TO_AFFECTS   0
#define TO_OBJECT    1
#define TO_IMMUNE    2
#define TO_RESIST    3
#define TO_VULN      4
#define TO_WEAPON    5

to the bottom of this add
#define TO_AFFECTS2   6

ok now underneath your
/*
 * Bits for 'affected_by'.
 * Used in #MOBILES.
 */

 at the bottom of this after all the spell_affect defines type this in
 /*
  *affects2 for additional affects
  */

  this way you know where to put the second set of affects.

  ok now find where it says

  struct    mob_index_data

  look in the list underneath it find the line that looks like this

  long              affected_by;
  add underneath it
  long		    affected2_by;

  now find the line

  struct    char_data

  look in the list for
  long			affected_by;
  and add underneath it
  long			affected2_by;

  then in character macros section
  find the line

  #define IS_AFFECTED(ch, sn)    (IS_SET((ch)->affected_by, (sn)))
  underneath it add
  #define IS_AFFECTED2(ch, sn)    (IS_SET((ch)->affected2_by, (sn)))

  now find the handler.c area
  look for this line
  char *    affect_bit_name    args( ( int vector ) );
  underneath it add
  char *    affect2_bit_name   args( ( int vector ) );

  now open up your handler.c file
  find the line
  void affect_modify (CHAR_DATA * ch, AFFECT_DATA * paf, bool fAdd)
  look for
  case TO_AFFECTS:
                SET_BIT (ch->affected_by, paf->bitvector);
                break;
underneath it put

  case TO_AFFECTS2:
                SET_BIT(ch->affected2_by, paf->bitvector);
                break;

look a little bit down from that youll see another case TO_AFFECTS
itll look like this though

  case TO_AFFECTS:
                REMOVE_BIT (ch->affected_by, paf->bitvector);
                break;
again undearneath this one add this

case TO_AFFECTS2:
                REMOVE_BIT(ch->affected2_by, paf->bitvector);
                break;

look for the line void affect_check (CHAR_DATA * ch, int where, int vector)

find case TO_AFFECTS:
                    SET_BIT (ch->affected_by, vector);
                    break;
add
     case TO_AFFECTS2:
                    SET_BIT(ch->affected2_by, vector);
                    break;

again scroll down a bit from there youll find this

    case TO_AFFECTS:
                        SET_BIT (ch->affected_by, vector);
                        break;
underneath that one add
    case TO_AFFECTS2:
                        SET_BIT(ch->affected2_by, vector);
						break;

go down a bit more youll find another one

     case TO_AFFECTS:
                        SET_BIT (ch->affected_by, vector);
                        break;

underneath it add
     case TO_AFFECTS2:
						SET_BIT(ch->affected2_by, vector);
						break;
Now open up act_wiz.c

find the line
void do_mstat (CHAR_DATA * ch, char *argument)

look down in this function for this:

if (victim->affected_by)
    {
        sprintf (buf, "Affected by %s\n\r",
                 affect_bit_name (victim->affected_by));
        send_to_char (buf, ch);
    }

underneath it add

if (victim->affected2_by)
    {
         sprintf(buf, "Also affected by %s\n\r",
            affect2_bit_name(victim->affected2_by) );
        send_to_char (buf, ch);
    }