Miasma

Miasma (瘴気) is a highly corrosive and poisonous gaseous dark purple mist that originates from Cracks in Mass for the Dead.

Overview
A mist that springs from the depths of the abyss of Cracks. It has corrupting effect, causing animals and plants to go wild, creating Contaminated Beasts. Even the smallest particles that are invisible can still have an effect. Those some power in the New World are not totally immune to its corruption, though the level of tolerance depends on the individual.

The gas coincides when a Crack spews out Chaos Beasts at regular intervals. The substance is only dissipated once all the Chaos Beasts are defeated.

Trivia

 * However, there are no cases where the people of the Great Tomb of Nazarick becoming violent, including the protagonist who has no combat ability.
 * No cure for the miasma exists so far, however efforts by both the Pharmacist's Guild and Nazarick are underway to develop one.
 * Gazef Stronoff was infected by the gas, however unlike most cases where monsters go feral he was still able to retain his warrior instincts and utilize his Martial Arts.