Disruptive Wave (originally DeMagic) is a recurring skill in the Dragon Quest series. Introduced in Dragon Quest III as a monster-exclusive attack, it nullifies all stat changes, such as those caused by buffs (Kabuff, Oomph), debuffs (Kasap, Deceleratle), and Tension.
It is typically known by major bosses and is almost always used by the final bosses, making the use of stat changing moves futile in such battles if one's luck is unrelentingly bad.
Zoma cast a blight upon players by introducing the skill to the series, discharging it incessantly while his shield is up.
In the remakes, Disruptive Wave is one of the special abilities that Psaro can learn.
Disruptive Wave is learned by recruited king slimes at level 18. As in Dragon Quest IV, the Zenithian sword can unleash this effect if used as a tool in battle.
Disruptive Wave is learned by heroes when they are City Heroes (rank 2).
Learned via the Hero vocation as in VI, but also by reaching rank 6 of the Druid vocation in the PSX version and rank 3 in the 3DS. It is superior (and cheaper) than The Great Leveller as it covers more effects.
Disruptive Wave is used by most of the later story bosses, starting with Dhoulmagus. It is referred to as an Icy Pulse, a literal translation of its Japanese name, as the Plus-Alpha duo were still getting a feel for the series in 2005.
Disruptive Wave is learned with 42 skill points allocated into Enlightenment skill. It costs 10MP to cast.
It is worth noting that Disruptive Wave acts slightly different in this installment as it now only affects the opposition. This makes debuffs viable against many bosses since they can't use the ability to clear them away. This isn't used as heavily by the story bosses (only King Godwyn and Corvus uses it). However, several of the grotto bosses and all the legacy bosses will use this ability.
Psaro can learn the ability when he joins for 8 skill points, and the skill only strips buffs from its targets instead of all stat modifiers. It costs 8 MP to use. He will also use it against the player in the battle against him. Additionally, Tension is not reduced when used.