+10% damage, and +10% additional damage upon destroying a lieutenant.
+2% Damage, +2% Damage (for lieutenants) per tier
"Killing a leader gives 10% bonus damage to the killing weapon"
Priority Target is a RareTower Module in Fortress: Destroyer that enhances damage properties when applied to a tower. Leaders/lieutenant are ships/air units with a Red aura, that often lead other ships/air units of the same type in battle. When the enhanced tower destroys these, it will enhance the modified tower's damage further, allowing the modified tower to gain a more & more powerful offense each kill.