Sadistic Surge is a recurring ability in the series. It is an ability used by Jihl Nabaat. It is a series of quick slashes followed with rapid stabs, an uppercut which launches a target into the air, and a Ruinga-like explosion as its finisher.
Sadistic Surge is Nabaat's Feral Link with input type Multiple and button order ←→↓←. When Sadistic Surge is used when Nabaat is a Paradigm Pack ally, it gains additional effects depending on the player characters' roles in the active paradigm: Bravery with a Synergist, Bravery and Shell with two Synergists, Protect with a Sentinel, Protect and Shell with two Sentinels, damage boost with Commandos, chain boost with Ravagers, HP recovery for Nabaat and a small damage boost with Medics, and increased Wound damage with Saboteurs.
Surge" is a word used in various contexts. The terms when the word "surge" is involved include: a sudden transient rush, flood or increase; sudden electrical spike or increase of voltage and current; swell or heave of the sea, and maximum amplitude of a vehicle's forward/backward oscillation."