If your talking about the place with the wizards and all that-I don't know how to turn
invisible + I don't think the game is finished

no not that its the place last island

You will need five relics and then when you defeat him its not finished because you still
need to level p and get all the abilities.

what r relics because i think that there quest that u need to do

if you help people (e.g fairies, bears, dragons etc.) they sometimes give you relics to
open doors to the ice minion or something. you can see how many you have on the inventory
screen at the bottom (the purple & white circles)

you need 4 of them

www.faqs.ign.com/articles/667/667825p1.html

You need five relics and when yoou r battling him you need to use banish against the magic
ball/attak thingies he tries to attak you with an when he falls, glide to him and attak
him untill he gets back up and quickly glide back if you dont glide back he will swing his
tail which does 100 damage. repaet this 3 times then you will defeat him. also if you want
to keep defeating him without starting a new game, you can swith off ur ds or dsi when the
story thingy says "THE END".