From Final Fantasy Wiki
The Demon Wall is a boss from Final Fantasy Tactics A2: Grimoire of the Rift. It appears only in the second half of a side quest at the Ruins of Delgantua, The Stone With No Name. The Demon Wall's main method of disposing of your units is to inflict them with debuffs and then push them off the edge of the battlefield with the Repel skill. Escaping this tactic is difficult because your units' starting positions force them to be locked in a small area surrounded by an abyss and the Demon Wall. Equipping Ribbons or other items that protect against debuffs is extremely helpful when attempting to defeat this menace.
A trap built long ago to ward off intruders. It pursues its quarry relentlessly, grinding their bones to dust.
The Trapped Demon is the name of the only Demon Wall in the game.
||Teleports random enemy target in front of user and inflicts Immobilize with 100% Accuracy.
||Front of user
||User moves forward one panel and knocks back unit in front of them. Units pushed into the abyss are KO'ed.
||Inflicts Petrify, Immobilize, or Sleep.
||Reduces target's HP to 1.