Jesus Christ, the Son of God
https://www.churchofjesuschrist.org/study/scriptures/bofm/hel/14.12-13
12 And also that ye might know of the coming of Jesus Christ, the Son of God, the Father of heaven and of earth, the Creator of all things from the beginning; and that ye might know of the signs of his coming, to the intent that ye might believe on his name.
13 And if ye believe on his name ye will repent of all your sins, that thereby ye may have a remission of them through his merits.
a spiritual death, yea, a second death,
https://www.churchofjesuschrist.org/study/scriptures/bofm/hel/14.16-18
16 Yea, behold, this death bringeth to pass the resurrection, and redeemeth all mankind from the first death—that spiritual death; for all mankind, by the fall of Adam being cut off from the presence of the Lord, are considered as dead, both as to things temporal and to things spiritual.
17 But behold, the resurrection of Christ redeemeth mankind, yea, even all mankind, and bringeth them back into the presence of the Lord.
18 Yea, and it bringeth to pass the condition of repentance, that whosoever repenteth the same is not hewn down and cast into the fire; but whosoever repenteth not is hewn down and cast into the fire; and there cometh upon them again a spiritual death, yea, a second death, for they are cut off again as to things pertaining to righteousness.