Dark Syphon (ダークアスピル, Dāku Asupiru?, lit. "Dark Aspir") is an ability in Kingdom Hearts III. It allows the user to recover their MP when Dark damage is taken. The greater the damage taken, the greater the MP recovery.
In Kingdom Hearts III, Dark Syphon is a support ability. It can be multi-installed to increase its effect.
Learning Dark Syphon
Kingdom Hearts III