You’ll find Supplements among the various essential supplies scattered in the post-apocalyptic world of The Last of Us Part 2. Supplements are somewhat rare consumables that are needed to unlock new skills for Abby to better help increase her combat effectiveness and survivability. Abby can have several skill trees; however, unlike other games, Ellie doesn’t start off with these skill trees. First, she has to discover Training Manuals - magazines and pieces of literature that impart knowledge to Abby so she use supplements to learn and apply the five skills each manual has to offer.
The main thing about these manuals is they are also hidden like most collectibles in the game, making it very possible for you to miss them and get completely locked out of skill trees if you’re not thorough enough. In our guide, we will list down the locations of the training manuals you can find in the game. Take note however, that similar to some weapons in the game, it’s possible to find these manuals in certain locations other than what we have listed. Nevertheless, it’s worth checking out these locations in your playthrough.
In the mission On Foot in Seattle Day 1, head towards the boat and collect the other materials from the shelves near the wall. Next, rotate the crank to let Alice and Manny go through. After the crank breaks, talk to Mel then find a steel cage at the back. Boost Mel up and wait for her to open the door on the second floor, above the workbench.
Regroup with Mel then pick up the ladder around the balcony. Place it to the yacht next then carefully cross it. Once you’re on the yacht, head inside and pick up the health kit, ammo, and the Covert Ops Training Manual on the desk to the right.
In the mission Hostile Territory in Seattle Day 1, after climbing over the fence, continue through the diner then go downstairs until you see the brick building with the sign Tang Fabrics & Imports. Instead of going there, turn around the corner and Abby will comment about the smell. Look for a window to the left where you can climb into. Inside, you'll find the Close Quarters Training Manual by the sink.
In the mission The Forest (Seattle Day 1), after defeating the seraphite brute and getting your backpack back, you'll enter an auto shop. Head to the office then turn to the right to find the Firearms Training Manual.
In the mission The Coast (Seattle Day 1), make your way to the top deck of the beached ferry. Turn left from the stairs to find the safe. Enter the code 90-77-01 to open it and loot the training manual inside.