Have you read the notes dotted about the place they tell you how to kill it, if you cant be bothered then heres how to do it
SPOILER ALERT
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Notice that the big fire pot thing in the middle of the room keeps spawning fire elementals these are the source of the giants invincibility, you have to take these out before you can hurt the giant but every time you kill one it gets sent to the fire pot again and respawns to kill them permanently you have to lure them to the ice room, once there they will freeze and die, there are 4 fire elementals to do this for just keep doing them one at a time once they are all dead the giant will become vunerable to your damage
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