Eins
From Chrono Compendium
General Information
Chrono Cross
These have something to do with Element execution, but we're not quite certain what. Most of these files contain legible ASCII strings embedded in the data: "ENVMAP", "sin-x.sin-v", and "LUSTER" are among the more common ones, suggesting some sort of drawing geometry commands.
Zeroing this file will cause the game to freeze/crash while attempting to use the corresponding Element in combat.
From: Modification