If you are speaking of Return of Christ based on Scriptures, He has certain mission and goals to fulfil at the time of return.
For instance, He would make all things new:
this must occur before the second death. the second death is the physical death.
Revelation 20:6
Blessed and holy is he that hath part in the first resurrection: on such the second death hath no power, but they shall be priests of God and of Christ, and shall reign with him a thousand years.
same idea from danielAnd he who was seated on the throne said, “Behold, I am making all things new.” Also he said, “Write this down, for these words are trustworthy and true.” Revelation 21:5
Daniel 12:2
And many of them that sleep in the dust of the earth shall awake, some to everlasting life, and some to shame and everlasting contempt.
or as Jesus the character referred to them as the dead that bury the dead.
self is like a book that must be open.He would open the Seal of the Book of God, so everyone may understand it:
Revelation 20:12
And I saw the dead, small and great, stand before God; and the books were opened: and another book was opened, which is the book of life: and the dead were judged out of those things which were written in the books, according to their works.
the seven seals are located upon the spine/back of the scroll/book. they are called chakras.Then one of the elders said to me, "Do not weep! See, the Lion of the tribe of Judah, the Root of David, has triumphed. He is able to open the scroll and its seven seals." Revelation 5:5
Any many other things as described in the Bible.