How do I pick a high-rod?

Hint 1 of 5:

They are way too hot to touch.

Hint 2 of 5:

You need to cool them off.

Hint 3 of 5:

You found something in Alexandria.

Hint 4 of 5:

A rod.  The rod of Ice.

Hint 5 of 5:

It was the spindle in the globe in the Museum.