How can I get to Fourbalus?

Hint 1 of 16:

Take a look at the bits of his tower for a big hint.

Hint 2 of 16:

Most of the parts of the tower aren't very sturdy.

Hint 3 of 16:

They certainly wouldn't hold up to explosions, for instance.

Hint 4 of 16:

You want to try to build your own explosives.

Hint 5 of 16:

Like sticks of dynamite.

Hint 6 of 16:

You'll need a few ingredients: the casing, the gun powder, fuses, and some
glue to hold everything together.  Spoilers on where to find these items
follow in the next hints.

Hint 7 of 16:

Casing: the pipes from the Inca's flute

Hint 8 of 16:

Gunpowder: from the powder keg: