Spoilers ahead for the hero of the sixth district, the boss's abilities and the victory unlocks.
After Stone Passage you'll enter the Neon District as Cyberpunk. This character choice is part of the campaign and doesn't require buying the Arena fighter. Cyberpunk brings a new set of attacks, so use the early encounters to get a feel for the controls.
Getting used to your weapons
Cyberpunk's normal attack fires a pistol. His additional abilities give him a burst from twin Uzis, a blade strike and Time shift. Shots check for obstructions, so a wall can block a shot even when the target is close.
Time shift gives you a brief advantage in the pace of a fight. Events continue and you can still take damage. Use the extra time to move into position or attack while keeping track of enemies and incoming shots.
Try spacing out your abilities against the first small group. Check your surroundings and see who's closing in before using the next one. A ranged fighter can still get caught at close quarters with an important ability on cooldown.
Through the district
The main route follows the city streets. Side alleys contain extra encounters and resources. The boss can appear without a full sweep of those alleys. Stop at the shops along the route if you need supplies.
Cyborgs, heavy machines and police officers are among the ordinary enemies. Officers fire projectiles, so keep moving even at a distance. A building corner can shield you from one line of fire, but it can block your own shot as well.
The kill meter tracks your fights. The boss encounter starts when you enter the final square. Check health and ability cooldowns before approaching, while you're still free to move around the district.
When Cyberpsycho speeds up
Cyberpsycho can accelerate too. When both of you are accelerated, he won't slow relative to you the way an ordinary enemy would during Time shift. Watch for the ability announcement and judge how fast he is actually moving.
In the first part of the fight, he uses melee strikes and rockets. At low health he enters a blade phase and becomes a greater threat up close. Stay mobile even when there is only a sliver of health left on his bar.
Victory awards 50 crystals and opens the rooftop district, Above the System. It also lets you purchase Cyberpunk for 200 crystals and Cyberpsycho for 500 for the Arena. They are two separate purchases. Winning this encounter unlocks the option to buy them.