Why a big difference, if I am honest?

Are humans immortal? Can they somehow survive without dying?

Must not die means that they are mortal, thus very capable of death and the mission requires you to keep them alive.

As a present, death do us part “is a part of the traditional wedding vows.

The signifies that the married couple intends to spend the remainder of their lives together – They will only be parted by death

part – note that it is used as a verb in this instance.

• S: (v) separate, piece, split (go one’s own way; move apart) “The
  friends separated after the party”
• S: (v) separate, part, split up, split, break, break up (discontinue an association or relationship; go different ways) “The business partners broke over a tax question,”; “The couple separated after 25 years of marriage.” S: (v) depart, place, put, put
• forth, set out, take off (leave) “The family took off for
  

As a present, death do us part “is a part of the traditional wedding vows.

The signifies that the married couple intends to spend the remainder of their lives together – They will only be parted by death

part – note that it is used as a verb in this instance.

• S: (v) separate, piece, split (go one’s own way; move apart) “The
  friends separated after the party”
• S: (v) separate, part, split up, split, break, break up (discontinue an association or relationship; go different ways) “The business partners broke over a tax question,”; “The couple separated after 25 years of marriage.” S: (v) depart, place, put, put
• forth, set out, take off (leave) “The family took off for
  

As a present, death do us part “is a part of the traditional wedding vows.

The signifies that the married couple intends to spend the remainder of their lives together – They will only be parted by death

part – note that it is used as a verb in this instance.

• S: (v) separate, piece, split (go one’s own way; move apart) “The
  friends separated after the party”
• S: (v) separate, part, split up, split, break, break up (discontinue an association or relationship; go different ways) “The business partners broke over a tax question,”; “The couple separated after 25 years of marriage.” S: (v) depart, place, put, put
• forth, set out, take off (leave) “The family took off for
  

As a present, death do us part “is a part of the traditional wedding vows.

The signifies that the married couple intends to spend the remainder of their lives together – They will only be parted by death

part – note that it is used as a verb in this instance.

• S: (v) separate, piece, split (go one’s own way; move apart) “The
  friends separated after the party”
• S: (v) separate, part, split up, split, break, break up (discontinue an association or relationship; go different ways) “The business partners broke over a tax question,”; “The couple separated after 25 years of marriage.” S: (v) depart, place, put, put
• forth, set out, take off (leave) “The family took off for
  

What does Divers mean, ” many-and-various places”?

Source.

What makes this a better source confirm that

what you quoted comes from somebody else?