lol!
This is really testing my memory, as I've not done this battle recently, but in addition to Six's subtle hint, I think that you can ... (Ctrl-A or Click-and-drag-over for spoiler below)
... use the Necklace of Missiles several times while it's in its ice incarnation, and finish it off with a blast from the Ring of Ram. This was the approach that I think I took with my Cavalier about three years ago(!), who obviously had no access to missile weapons. Celestial Fury's blast can be used also. As others have suggested, you can chip away with elemental arrows, bolts, and sunfire bullets, or buff up with Oil of Speed + Ilbratha's Mirror Image and charge in with the Flail or similar.
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