Combination Strike

Combination Strike is a Monk passive skill, unlocked at level 50.

In-game
Most builds use only one Primary skill, so this passive is an effective +10% all damage boost (not multiplicative with other similar modifiers). However, custom builds with two Primary skills exist, essentially giving up a skill slot for the plain damage boost.

Each buff from each skill has a 3 seconds separate duration, instead of adding stacks.

The skill only affects Primary attacks: Fists of Thunder, Deadly Reach, Crippling Wave and Way of the Hundred Fists. Other skills that replenish Spirit do not contribute to it.