The Etunaz

A creature in Romanian folklore that looks like a giant, monstrous, moose with arms near it’s mouth.

According to Milky, it is a story used to frighten children into being good. If you are good, it will grant you a wish. If you are bad, it will throw you up into a tree.

According to the Book of Knives the Etunaz itself in its realm (the Gray Lands) has no known dagger combination.

The Etunaz in "this" realm has none.

Note: The Gray specifically says "Unknown" while here it says "none."
The text seems to suggests the Etunaz does not exist in "this" world, but it's "spirit" moves to followers which move in and out of its form.

Etunaz Follower:
A follower seems to be any follower, or person present, not currently inhabited by the Etunaz spirit.
Daggers: 1 or 2 or 4
Dagger: 3 "Returns follower to form" and is physically vulnerable.

Etunaz Priest:
A priest seems to be any follower that is inhabited by the spirit.
Daggers: 1 or 2 or 4
Dagger: 3 "Returns follower to form" & "drives Etunaz" "away" and is physically vulnerable.

The Etunaz Shrine:
The book says physical destruction of the shrine "cleanses" the area of the Etunaz with no daggers needed.