Nightmare

Nightmare is a new Ailment introduced in Monster Hunter Frontier Ultimate. The element slowly drains your health whilst making you invisible to your hunting party. It also prohibits healing items and songs with the Hunting Horn.

Contracting and Effects
The only way to get this Ailment is to have it given to you by either the Elder Dragon Nockturnus or the Shadow Wyvern Naveldal attacking you with thier attacks. The attack works in a similar way to Goa Magara's Dragon Virus, in the way that it builds up a small bar over time, but this time you can see your other hunter's progress on this element.

The effects of the element are simple; you cannot use any sort of healing, buff or curing item, songs cannot be played on the Hunting Horn, as all the notes turn out black and the song played will have no effect. Also the screen and HUD gradually darken, making vision hard and making it tough to tell both the levels of your Health and Stamina.

How to remove
To remove the Ailment, you can either wait for the effects to wake up or use the RedPotion item, as this will cure the status directly, and harm any Nightmare-inflicting monster in the area.