Vial of Purified Water

Acquisition
This is a temporary skill that can be obtained and used only during the Nundu Bay mission. It is needed to defeat the Harbingers of Twilight and the Harbinger of Nightfall. It can be obtained by accepting it from Elder Jonah at the start of the mission. It will remain on the skill bar until the mission concludes.

Trivia

 * This is probably inspired by the use of holy water as an apotrope against evil supernatural creatures.