|Effect||Modifications last an additional hit longer|
|Next Manual||Smoke: Chemistry|
|Previous Manual||Bomb: Containment|
Obtaining this manual improves the durability of melee upgrades, giving you an additional one-hit kill on modified melee weapons. If you collected the first manual on melee upgrades, the effects will stack.
When you exit the sewers, there will be a red brick house in the suburbs. On the second floor of the house, you will find an attic access door in the ceiling, which Joel can boost Ellie up into; she will return with this training manual.