Acid

 is an enemy that appears in. Mostly amorphous blobs of orange goop, these creatures exhibit some humanoid features such as mouths, eyes, and arms. Occasionally, they curl up into puddles, which increases their Defense. Attacking them should cause them to unfurl into the true form. Acid share similar palette forms with Alkali, Shadows, and Ion Cloud, and often accompany large groups of them in battle. The main difference is the color. Acid are orange, Shadow are purple, Ion Clouds are black, and Alkali are green.

Battle and Strategy
Found in the Derelict Factory, which is located in the Future, these enemies often accompany Shadows. Impervious to physical attacks and weak to Light, it is far easier to kill Acid using Magical Techs such as Lightning, or physical Techs that deal Light damage, such as Wind Slash. In battle, Acid occasionally uses Flamethrower, which is similar in animation and damage to the Tech performed by Lucca.

Etymology
Acid is a liquid compound, found in an abundance of places in a many varieties. Commonly, however, this substance is found in Alkaline Batteries and other machines, which appears to be its use here, since Acid are found in a highly advanced technological era.