Blood Moon Essence
Actual answer here: The wisps that drop the Blood Moon Essence are rare and only spawn during a Bloodmoon in Yaesha.
How to Get a Bloodmoon?
Teleport out of Yaesha completely and return to a point other than your last checkpoint and go outside, if the trees are red, and there’s a giant red moon in the sky you will see wisps floating around.
Just FYI, teleporting between points in Yaesha when the Bloodmoon is active doesn’t get rid of the Bloodmoon.
The best spots for farming these are:
- The Far Woods
- The Root Nexus.