Weak Point

 is a Heroes Monkey Knowledge point in Bloons TD 6, added in Version 15.0. While this MK is active, all attacks from Heroes deal +1 Ceramic and +1 Fortified damage. To unlock, it requires eight heroes knowledge points invested, Big Bloon Blueprints, Monkeys Together Strong, and a one-time purchase of 1,000.

Summary
This is a small bonus that allows Heroes to become more useful versus Ceramics and Fortified. It is most useful for fast-attacking high projectile heroes such as Adora and Captain Churchill.

Tips

 * This MK applies for all attacks. So therefore a hero who attacks fast and/or produces many projectiles will benefit the most out of this MK.
 * Although this MK is very deep in the Hero MK Tree, it is not the strongest MK of the entire tree. Rather, Empowered Heroes with its instant Level 3 effect is a lot stronger in comparison to just +1 Ceramic and Fortified damage. However, Weak Point is very helpful in the late-game when using a high-DPS hero.
 * While Weak Point makes the greatest difference on higher hero levels and during late-game, Empowered Heroes' early-game benefit is powerful, especially on Co-Op Mode where Hero XP is split among multiple Heroes.

Trivia

 * The Weak Point MK icon resembles fortification breaking off a MOAB.
 * It is the only MK that requires all other monkey knowledge in its tree in order to be purchased.