What is the strongest skill in the game?

Of all the skills in the game, probably the dumbbell is the the strongest. You can get it by getting a brick to level 5 and the fitness guide to level 1.

Then you may be offered the Dumbell as a skill option which is the evolution form of the brick.

The dumbell, while seemingly not visually impressive does a great deal of damage in many directions, taking valuable HP from many zombies or killing them outright.

The Dumbbell in action - Along with a heap of other skills!

Other very strong skills include the Durian, Lightning Emitter and Laser Launcher at their evolution levels.

You can find out more about skill evolutions and how to get them in our Evolution Guide: https://www.appgamer.com/survivorio/evolution-skills

Whistling Arrow and Lightning Emitter work fantastically at all levels. Massive dmg.