In fact, even Fëanor may not have been able to copy them as part of his essence went into their making.
She wondered what it could be; had there been some other object in the room that got a part of Ithanalin's essence?
"Until I was 14, I played mostly for the animals, and that experience is part of my essence."
For the creatures, Being is not part of their essence.
It was part of its essence that it should be frustrated.
How many times do we have to prove that this choice is a fundamental part of our essence, over and over?
In fact, Fëanor himself could not copy them, as part of his essence went into their making.
The idea that information and order are part of life's essence has been with us for 2,000 years.
Was Sanda - or some part of her essence - somehow still alive?
That which cannot be eliminated is part of the example's essence.