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[[Waller]] is a [[Boss Modifier]] found on Champions and Bosses, but not boss' minions, in Diablo III.

One of the more interesting boss affixes in the game, this ability allows monster to create a waist high stone wall that blocks player movement (a few [[skills]] can [[Teleport]] or [[Leap]] over walls) and most projectile attacks. Walls only persist for a few seconds before crumbling to dust, and they can be helpful at times, blocking off enemies from reaching the hero, but more often they are dangerous obstacles that block player movement. They are most dangerous when combined with other boss modifiers such as [[Arcane Enchanted]], [[Plagued]], [[Desecrator]] and others that deal high damage and need to be avoided, but even the fact that your player is trapped and unable to escape (in most cases) can be deadly, especially on Inferno.

Waller is one of the few boss mods that differs considerably between Champions and Bosses; Champions can all create Walls, but only short, straight ones. These are always horizontal to the direction of the Champion, and thus if Champions are spread out around the hero, their walls can overlap and form T or + shapes and potentially be nasty traps. Bosses create walls that are like three-sided rectangles, with the open end towards the boss. These trap the hero in a sort of chute that holds them in place and allows an exit only past the boss.