Intimidate

Intimidate is a debuff that causes the affected target to take 10% increased attack damage.

Sources

Champion's passive First to Strike, Last to Fall
Guardian's passive Unwavering Crusade (on minion hit)
Ascendant's passive Champion
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A weapon with the Jagged fossil modifier 15% chance to Intimidate Enemies for 4 seconds on Hit
Watcher's Eye with the modifier Your Hits Intimidate Enemies for 4 seconds while you are using Pride
Gloves with the Hunter modifier 5-10% chance to Intimidate Enemies for 4 seconds on Hit

Version	Changes
3.1.0	Intimidate now causes enemies to take 10% increased Attack Damage (rather than 10% increased Damage).