A counter-spell was a type of spell where the primary effect was to inhibit, remove, or negate the effects of another spell. It could be cast by a merperson via any suitable source of moonlight, or by merpeople as a whole by using a moonstone itself.

Counter-spells

• Metamorphosis/Tailless Spell
• Metamorphosis/Unmetamorphosis
• Enlargement Spell/Shrinking Spell
• Limited Transformation/Legs Spell
• Moon Spell Control/Moon Spell
• Golden Palm
• Legs Spell/Nemopedalism Spell

Trivia

• There also existed some potions, including the Neutralizing Potion, that could neutralize other enchantments and spells, and served as potion versions of the counter-spells.

Spells and Potions
Arctic Marshmallow • Counter-spell • Fifty Moons Potion • Golden Palm • Healing Potion • Knowledge Transference Spell • Moisturizing Lotion • Nemopedalism Spell • Neutralizing Potion • Perfume Creation • Shape-change Mixture • Tailless Spell • Transmutation Spell • Turn the Tide • Water Dragon Spell • Wish Granting Potion

Moon Ring Spells
Accelerated Growth Spell • Coma Spell • Containment Spell • Flora Manipulation Spell • Counter-spell • Duplication Spell • Enlargement Spell • Force Field Spell • Healing Spell • Incineration Spell • Legs Spell • Levitation Spell • Object Manipulation Spell • Rain Stopping Spell • Remote Spell • Shrinking Spell • Snowing Spell • Storm Spell