Cannonball!
From RoR Wiki
Cannonball! is a Tome of Knowledge Achievements unlock for the Pursuits section.
Unlock for Order & Destruction
- Cannonball!
10800, 45800 - In Barak Varr
Click on "Crate of Cannonballs" at the "The Sea's Anvil" major landmark, inside on the north west side of the upper deck.
Rewards: XP: 150