How to Craft Explosive Arrows
Explosive Charge + Binding
Explosive Arrows in The Last of Us 2 can only be crafted by Ellie. To unlock the recipe, you need to unlock the “Craft Explosive Arrows” in the “Explosives” skill tree. To find the Training Manual, you need to make your way toward the tall residential building during Chapter 18: Seraphites. You need to climb the truck to go through the window and inside the first room on the left side.
Once inside, inspect the Workbench to get attacked by a group of enemies, after dispatching these enemies, head inside the room from where they were hiding to find the Training Manual.