Certain mods need 4 instead of 2 to complete a set:
Critical Damage
Offense
Speed
In-game you can click on the box under their character that shows the blue/yellow mod logo and it will display all available set bonuses plus how many you need of each.
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Critical Damage
Offense
Speed
In-game you can click on the box under their character that shows the blue/yellow mod logo and it will display all available set bonuses plus how many you need of each.
Thanks for your answer