http://www.gamebaker.com/rmxp/scripts/battle-items.htm
  시전시 아이템을 소모하는 스킬을 만드는 스크립트입니다.  아이템을 사용하는 스킬을 만들 때는 DB에서 아이템 이름 뒤에 /S[스킬id]라고 써 주면 됩니다. (S는 항상 대문자)  물론 해당 아이템은 전투에서 사용가능해야 합니다.


#=============================================================================
# ** SG Skill Invoking Battle Items
#=============================================================================
# sandgolem
# Version 1
# 3.06.06
#=============================================================================

# Place S[#] in any of your item (not armor, weapon) names
# The item will use that skill when used in battle.

#=============================================================================
#
# To check for updates or find more scripts, visit:
#      http://www.gamebaker.com/rmxp/scripts/
#
# To use this script, copy it and insert it in a new section above "Main",
# under the default scripts, the SDK if you're using it, and anything else
# that rewrites this part of battle.
#
# SG Settings Control is required for this script! Must be above this.
#
# Have problems? You can leave me a message at:
# http://www.gamebaker.com/users/sandgolem
#
#=============================================================================

#--------------------------------------------------------------------------
# * SDK Log Script
#--------------------------------------------------------------------------
begin
  SDK.log("SG Skill Invoking Battle Items", "sandgolem", 1, "3.06.06")
  if SDK.state("SG Skill Invoking Battle Items") != true
    @sg_skillinvoking_disabled = true
  end
  rescue
end

#--------------------------------------------------------------------------
# * Begin SDK Enable Test
#--------------------------------------------------------------------------
if !@sg_skillinvoking_disabled

class SG_Start
  alias sandgolem_sinvoke_start start_game
  def start_game
    sandgolem_sinvoke_start
    sg_skillinvoking_set
  end

  def sg_skillinvoking_set
    if $sg_loaded != true
      $data_sg['invoke items'] = {}
      for i in 1...$data_items.size
        if $data_items[i].name.include?('S')
          $data_sg['invoke items'][i] = $data_items[i].name.slice(/\[S][([0-9]+)]/).to_s
          $data_sg['invoke items'][i].gsub!(/\S[/,'')
          $data_sg['invoke items'][i] = $data_sg['invoke items'][i].chop
          $data_items[i].name.gsub!(/\[S][([0-9]+)]/,'')
        end
      end
    end
  end
end

if $sg_loaded != nil && $sg_loaded != true
  sg_temp = SG_Start.new
  sg_temp.sg_skillinvoking_set
  sg_temp = nil
  $sg_loaded.refresh
end

class Game_Battler
  attr_accessor :sg_sinvoke
end

class Game_Actor < Game_Battler
  alias sandgolem_sinvoke_actor_canuse skill_can_use?
  def skill_can_use?(skill_id)
    if @sg_sinvoke
      return super
    end
    sandgolem_sinvoke_actor_canuse(skill_id)
  end
end

class Scene_Battle
  alias sandgolem_sinvoke_battle_skillact make_skill_action_result
  def make_skill_action_result
    sandgolem_sinvoke_battle_skillact
    if @active_battler.sg_sinvoke
      @active_battler.maxsp -= @active_battler.sg_sinvoke
      @active_battler.sg_sinvoke = nil
    end
  end
 
  alias sandgolem_sinvoke_battle_itemr make_item_action_result
  def make_item_action_result
    if $data_sg['invoke items'].has_key?(@active_battler.current_action.item_id)
      @item = $data_items[@active_battler.current_action.item_id]
      unless $game_party.item_can_use?(@item.id)
        @phase4_step = 1
        return
      end
      if @item.consumable
        $game_party.lose_item(@item.id, 1)
      end
      @active_battler.current_action.item_id = nil
      @active_battler.current_action.skill_id = $data_sg['invoke items'][@item.id].to_i
      @active_battler.sg_sinvoke = $data_skills[@active_battler.current_action.skill_id].sp_cost
      @active_battler.maxsp += @active_battler.sg_sinvoke
      @active_battler.sp += @active_battler.sg_sinvoke
      make_skill_action_result
      return
    end
    sandgolem_sinvoke_battle_itemr
  end 
end

#--------------------------------------------------------------------------
# * End SDK Enable Test
#--------------------------------------------------------------------------
end