Walk the grassland and wild Synths will come to you. Get close and a battle starts. Lower a Synth's health, then use the rhythm tuner to harmonize it into your Echo-Dex. Beat the Circuit Master at the end of the path to win.
Move: WASD / arrows · Confirm: Enter or Space · Cancel: Esc or Backspace · Echo-Dex: E
Each side has two active slots, a frontline and a support. Synths act in speed order each round. Affinities form a cycle: Solar beats Abyssal, Abyssal beats Arcane, Arcane beats Seismic, Seismic beats Galvanic, and Galvanic beats Solar. Harmonize chance rises with the target's missing health and how well you hit the rhythm ring.