"A... visitor? No. No no no. Visitors don't come here. Only errors. Are you an error?"
Vex is a gatekeeper boss, not a main district boss, which means fewer arcade machines to clear beforehand and a tighter time window to prep your team. He's a glitching AI trapped in Underground static — mechanically, that translates to unpredictable energy steals and a Chrome-type signature that reflects damage back at you. The right team makes Vex trivial. The wrong team makes him a brick wall.
Vex's signature Data Phantom is a Chrome type, which means up to 10% of your damage bounces back. If your main is already low on HP, one big triple-attack spin can kill you from the reflect alone. He also drains energy at unpredictable intervals, so sitting on 6 energy for a jackpot turn rarely works — he'll steal it before you can spend it.
Team composition wins this fight before the first spin. Here's the 1 Main + 3 Support build that counters Vex's specific mechanics:
Need creatures? Browse the full Token-mon roster or read the metal type guide for deeper type math.
Bet Tier 4 early and often. Vex's match chance is close to yours — you need the guaranteed double plus the 1.25x amplifier to push past his Chrome reflect.
Never sit on 6 energy. Spend it as soon as you have it. Any energy above 4 is energy Vex might steal, and stolen energy is worse than spent energy.
Avoid Tier 6 jackpots. They feel good but they're slow to set up, and Vex's drain turn is the first thing he does when your pool gets full.
If you're new to energy tiers, read the slot-reel battle system explainer first.
Building a Chrome team to mirror Vex's type. Same-type teams trade into each other flat, and Vex's drain means you'll lose the energy war. Iron beats him; Chrome draws with him.
Data Phantom reflects 10% of incoming damage. This means a clean 200-damage triple sends 20 damage back at you — not much. But a 400-damage amplified triple sends 40 back, and if your main is already at 50 HP that finishes you. Watch your own HP before every big spin.