Type Un-Zero (Ar tonelico II: Melody of Metafalica)

Although stats-wise isn't a large improvement over the Type III or Type 48, it could be said that this monster is actually the long-delayed renewal model for the Old Type Zero, as it has almost the entirety of its moveset while also adding immunity to the Sickness and Stun statuses. This makes it quite dangerous due to the S-KILLER skill, not to mention it also replaced the old P-ARMOR with S-BOOST, exchanging the defensive increase for causing more damage to the player's party. Given this, these monsters should be fought cautiously and the player should try to use Song Magic to eliminate them as fast as possible.