Midnight Yew Essence in Tribes of Midgard is a material used for a couple recipes that can prove useful on your adventures.
Midnight Yew Essence Tribes of Midgard: How to Get
Much of the clues for how to collect Midnight Yew Essence in Tribes of Midgard comes from the name.
To collect Midnight Yew Essence, you must seek out Lunar Yew trees and harvest them specifically at nighttime. Lunar Yew trees can be found in swamp biomes.
If you were to harvest the Lunar Yew trees during the day, you will just get branches and wood as you do, with chances to collect bird feathers and souls as well.
With the release of the game's roadmap, we may see the Midnight Yew Essence be used for more recipes in the future.