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Code:

#==============================================================================

# HP Sacrifice

# By LockeZ

#==============================================================================

# This script allows you to create skills and items that cost HP when used.

#

# Compatible with the default battle system.

# Compatible with Tankentai.

#

# Contact me at ff3lockez@yahoo.com with questions.

#==============================================================================



module LockeZ

  # Do not remove this line

  HP_Sacrifice_Action = {'Skill' => {}, 'Item' => {}}

  # Do not remove this line

  

  # Below here are the lines you can change to control which actions

  #   cost HP, and how much.

  

  # Format for each line:

  # ---------------------

  # HP_Sacrifice_Action[action_type][id] = [chance, formula, amount, anim_id, pop, can_kill]

  

  

  # And here is what each of those things means:

  

  # action_type = Should be set to 'Skill' or 'Item'

  # id          = ID number of the skill/item that costs HP

  #

  # chance  = chance of damaging self

  # formula = How the amount lost is calculated.  Must be 'integer' or 'percent'.

  # amount  = Amount of HP lost, based on formula.  If formula is set to

  #           integer, this is the actual amount lost.  If it's set to percent,

  #           this is the percent lost.

  # anim_id = ID of the animation shown over the user; leave nil or 0 for

  #           no animation

  # pop     = true or false, whether the sacrificed amount pops up visually

  #           over the user's head like damage.

  # can_kill = true or false.  If false the skill will not reduce the user below

  #            1 HP.  If true it can kill the user.

  

  

  # Example Skills

  HP_Sacrifice_Action['Skill'][28] = [100, 'integer', 250, nil, true, false]

  # The "Darkness" spell (spell #28) now costs 250 HP to cast.  It won't

  #   reduce the caster below 1 HP.

  

  HP_Sacrifice_Action['Skill'][30] = [100, 'integer', 500, nil, true, false]

  # The "Mass Darkness" spell (spell #30) now costs 500 HP to cast.  It can

  #   kill the caster.

  

  HP_Sacrifice_Action['Item'][10] = [100, 'percent', 100, 51, false, true]

  # The "Full Tonic" item (item #10) now costs 100% of the user's max HP.

  #   In other words, it always kills the user.  Animation 51 is shown.

  #   The amount of damage isn't shown.

  

  

end



#==============================================================================

# ** Don't modify anything below this point.

#==============================================================================





#==============================================================================

# ** Scene_Battle

#------------------------------------------------------------------------------

#  This class performs battle screen processing.

#==============================================================================



class Scene_Battle

  include LockeZ

  

  #--------------------------------------------------------------------------

  # These 2 methods makes the script compatible with the default battle system.

  #--------------------------------------------------------------------------

  unless respond_to?('step4_part3')

    alias make_skill_action_result_hp_sacrifice make_skill_action_result

    def make_skill_action_result

      make_skill_action_result_hp_sacrifice

      action = @active_battler.current_action

      if action != nil and HP_Sacrifice_Action['Skill'].include?(action.skill_id)

        sacrifice_hp(@active_battler, HP_Sacrifice_Action['Skill'][action.skill_id].dup)

      end

    end

  

    alias make_item_action_result_hp_sacrifice make_item_action_result

    def make_item_action_result

      make_item_action_result_hp_sacrifice

      action = @active_battler.current_action

      if action != nil and HP_Sacrifice_Action['Item'].include?(action.item_id)

        sacrifice_hp(@active_battler, HP_Sacrifice_Action['Item'][action.item_id].dup)

      end

    end

  end

  

  #--------------------------------------------------------------------------

  # Sacrifice HP

  #     battler : active battler

  #     action  : action

  #--------------------------------------------------------------------------

  def sacrifice_hp(battler, action)

    if action[0] >= rand(100)

      if action[1] == 'integer'

        hp_sacrificed = action[2].to_i

      elsif action[1] == 'percent'

        hp_sacrificed = (battler.maxhp * action[2] / 100).to_i

      end

      if action[5] == false

        hp_sacrificed = [battler.hp - 1, hp_sacrificed].min

      end

      if hp_sacrificed != 0

        # This line happens only in the DBS

        # Atoa's CBS does this automatically for all damage

        battler.hp -= hp_sacrificed



        battler.damage = hp_sacrificed

        battler.animation_id = action[3].nil? ? 0 : action[3]

        battler.damage_pop = action[4]

        @status_window.refresh

      end

    end

  end

end

Code:

#==============================================================================

# ** Window_Skill

#------------------------------------------------------------------------------

#  This window displays usable skills on the skill and battle screens.

#==============================================================================



class Window_Skill < Window_Selectable

  #--------------------------------------------------------------------------

  # * Draw Item (Rewrite for HP costs.

  #     index : item number

  #--------------------------------------------------------------------------

  def draw_item(index)

    skill = @data[index]

    if @actor.skill_can_use?(skill.id)

      self.contents.font.color = normal_color

    else

      self.contents.font.color = disabled_color

    end

    x = 4 + index % 2 * (288 + 32)

    y = index / 2 * 32

    rect = Rect.new(x, y, self.width / @column_max - 32, 32)

    self.contents.fill_rect(rect, Color.new(0, 0, 0, 0))

    bitmap = RPG::Cache.icon(skill.icon_name)

    opacity = self.contents.font.color == normal_color ? 255 : 128

    self.contents.blt(x, y + 4, bitmap, Rect.new(0, 0, 24, 24), opacity)

    self.contents.draw_text(x + 28, y, 204, 32, skill.name, 0)

    #draw costs

    if LockeZ::HP_Sacrifice_Action['Skill'].include?(skill.id)

      self.contents.font.color = text_color(2) #hp in red.

      action = LockeZ::HP_Sacrifice_Action['Skill'][skill.id];

      if action[1] == 'integer'

        cost = action[2].to_i

        self.contents.draw_text(x + 232, y, 48, 32, cost.to_s, 2)

      elsif action[1] == 'percent'

        cost = action[2].to_i

        self.contents.draw_text(x + 232, y, 48, 32, cost.to_s + "%", 2)

      end

    else

      self.contents.draw_text(x + 232, y, 48, 32, skill.sp_cost.to_s, 2)

    end

  end

end