vital part
vital piece
vital element
vital component
vital ingredient

"Men, we have just received a vital piece of information from the four heroes."

The first was obtaining a certain vital piece of information.

For the most part, this is a vital piece that holds one's interest.

But there was no missing the key fact, the vital piece of evidence.

Did these two lines contain some vital piece of information?

Guess wrong and you could end up missing a vital piece of information.

The driver is an important and vital piece to a program application.

Among the things Jordan kept to himself was a vital piece of information that might have helped our country.

Like now, the Court had still been missing a vital piece of the puzzle.

Why was she giving away such a vital piece of information?