ICE SWORD! (Made With Pykrete)

That's a heck of a sword there,

And it's way stronger than it would have been if it were made of just ice.

See, ice is strong in compression but weak in tension. Paper - toilet paper, for example - is the opposite: weak in compression but strong in tension.

Combine them together, and you get a whole that is far greater than the sum of its parts. See, that's a composite for you.