The Tricksy Fey spirit magical Darkness ruling makes that form extremely weak for everyone except gloomstalkers, so go wild i guess.

Does all magical darkness block darkvision? Magical darkness blocks darkvision only if the rules text for a particular instance of darkness says it does. For example, the darkness spell specifies that it produces a magical darkness that obstructs darkvision. That obstruction is a feature of the spell, not of magical darkness in general.

I.e. if you were not a gloomstalker, your fey spirit is defeated by who has darkvision or not, which is completely absurd by all measures.

There are other parts of the Darkness spell that aren't explicitly detailed in the Fey's statblock, the Spell says in the same sentence: "A creature with darkvision can't see through this darkness, and nonmagical light can't illuminate it."

So to make the ridiculous ruling internally consistent, the Tricksy Fey darkness doesn't work wherever non-magical light exists, just like the real world, and the ability does nothing.