Like the name suggested, this system can upgrade some certain in-game characters that players can change or upgrade the skills based on players' need. Characters can be upgraded up to three skills with various options provided.
Beside the common skills which can be found in characters obtainable from AI Ticket, this system now features more skills that are specialized in some certain modes. These skills are categorized into two parts:
- Normal Skills: colored blue, and can be swapped with the Skill Swap Card. Obtainable from Item Shop, Mileage Shop or from Reward Crates in Zombie Mode.
- Special Skills: colored gold, and can't be swap, but can only be upgraded by Skill Upgrade Card instead.
|Auto-reload primary weapons (in Normal Mode).||Auto-reload secondary weapons (in Normal Mode).|
|Immunity to self/teammates' grenades.||Reduced fall damage.|
|Reduced blinding time from Flashbang.||-||-|
|Penetrating damage through mutants' armors.||Increased AC point (in Mutation Mode).|
|Additional ammo magazine (in Mutation Mode).||Increased movement speed (in Mutation Mode).|
|Increased movement speed (in 30-player MM).||Increased health point (in 30-player MM).|
|Mutation Vest||-||Emotion (press "N").|
- The Emotion skill is default for some characters like ULP-Renewal, and it can't be swapped to other skills, however.