Combo Count (commonly called combos) is a counter of physical attacks on any character (main or mercenary) being attacked. Magic attacks do not affect the combo count. Each physical attack adds a combo count to a character that is hit (up to 1 combo per turn). When the combo count hits 3, a stun goes into effect. The combo count on any character that is not physically hit in any given round resets to 0. There are strategies for dealing with stuns and reducing combo counts, see the stun article about more details. Don't confused combo count with combo rate.