.. What should I do with the primitive art?

It looks like it could be useful.

Have you read the note next to it?

Apparently it almost sunk a ship.

This primitive art can double as a catapult.

But you need to trigger it.

To use the catapult, you need to drop something on it...

From above.

There's a rock at the edge of the mountain top.

I've already used the rock.

Why don't you push it?

I sunk my ship!

Aiming the catapult is a horse of a different story.

How do I aim the catapult?

How do I hit the tree?