It's not a herofield, it's on the wounds helper.
Code:
~ If we're not enabled, get out now
doneif (field[pIsOn].value = 0)
if (hero.tagis[source.UCWound] <> 0) then
~ Add to our Wounds
hero.childfound[Wounds].field[wndTotal].value += field[pAdjust].value
endif