i'm not good at english, but i ?althoug? want to help you.
You have to make the statue as en event.the startfork is 'on hero touch'.when you have done this you have to make an event with this:

<>fork condition tab '001' OFF
<>Item change +sword 1
<>move event 'Statue' change grafik 'statue2'
<>start battle 'endboss'
<>set tab '001' ON
<>
<>?????
<>
<>end


i hope i can help you with this...sorry when you cant read it or the event names are wrong....(i have the german patch^^)