[CapedCrusader]

Try this:
herofield[powPoints].text -= 1
It's just stored in a text field rather than a number field is all. You can still do math with it. You just have to be a little more careful. And since you're deep into this, here's the code to determine casting mods so you can see why:

    var castingmod as string
    var castingno1 as number
    var castingno2 as number
    var length1 as number
    var lengthall as number
    var start2 as number
    var length2 as number
    var rawnumber1 as number
    var rawnumber2 as number
    var iteminfo as string
    var divisor as number
    iteminfo = ""
    divisor = herofield[acCastDiv].value

if (hero.tagis[Hero.NoPowerPts] <> 0) then
      ~ #-#
      if (pos(field[powPoints].text,"-") > 0) then
        length1 = pos(field[powPoints].text,"-")
        start2 = pos(field[powPoints].text,"-") + 1
        lengthall = length(field[powPoints].text)
        length2 = lengthall - start2
        rawnumber1 = left(field[powPoints].text,length1)
        castingno1 = round(rawnumber1/herofield[acCastDiv].value,0,-1)
        rawnumber2 = right(field[powPoints].text,length2)
        castingno2 = round(rawnumber2/herofield[acCastDiv].value,0,-1)
        castingmod = "-" & castingno1 & " to -" & castingno2
      ~ #/section
      elseif (pos(lowercase(field[powPoints].text),"/section") > 0) then
        length1 = pos(lowercase(field[powPoints].text),"/section")
        rawnumber1 = left(field[powPoints].text,length1)
        castingno1 = rawnumber1
        castingmod = "-" & castingno1 & " per 2 sections"
      ~ Special
      elseif (pos(lowercase(field[powPoints].text),"special") > 0) then
        castingmod = "Special"
      ~ #/#
      elseif (pos(field[powPoints].text,"/") > 0) then
        length1 = pos(field[powPoints].text,"/")
        start2 = pos(field[powPoints].text,"/") + 1
        lengthall = length(field[powPoints].text)
        length2 = lengthall - start2
        rawnumber1 = left(field[powPoints].text,length1)
        castingno1 = round(rawnumber1/herofield[acCastDiv].value,0,-1)
        rawnumber2 = right(field[powPoints].text,length2)
        castingno2 = round(rawnumber2/herofield[acCastDiv].value,0,-1)
        castingmod = "-" & castingno1 & "/-" & castingno2
      ~ #+
      elseif (pos(field[powPoints].text,"+") > 0) then
        length1 = pos(field[powPoints].text,"+")
        rawnumber1 = left(field[powPoints].text,length1)
        castingno1 = round(rawnumber1/herofield[acCastDiv].value,0,-1)
        castingmod = "-" & castingno1 & "+"
      ~ #/Corpse
      elseif (pos(lowercase(field[powPoints].text),"/corpse") > 0) then
        length1 = pos(lowercase(field[powPoints].text),"/corpse")
        rawnumber1 = left(field[powPoints].text,length1)
        castingno1 = round(rawnumber1/herofield[acCastDiv].value,0,-1)
        castingmod = "-" & castingno1 & "/corpse"
      ~ #
      else
        castingno1 = round(field[powPoints].text/herofield[acCastDiv].value,0,-1)
        castingmod = "-" & castingno1
        endif
     iteminfo &= "Casting Modifier: " & castingmod & "{br}"
    else
      iteminfo &= "Power Points: " & field[powPoints].text & "{br}"
      endif