What will this actually be like?

Psalm 91:5 Thou shalt not be afraid for the terror by night; nor for the arrow that flieth by day;

 6 Nor for the pestilence that walketh in darkness; nor for the destruction that wasteth at noonday.

 7 A thousand shall fall at thy side, and ten thousand at thy right hand; but it shall not come nigh thee.

 8 Only with thine eyes shalt thou behold and see the reward of the wicked.

Will it be similar to, or even more severe than what happened in the wilderness?

Numbers 16:45 Get you up from among this congregation, that I may consume them as in a moment. And they fell upon their faces.

 46 And Moses said unto Aaron, Take a censer, and put fire therein from off the altar, and put on incense, and go quickly unto the congregation, and make an atonement for them: for there is wrath gone out from the LORD; the plague is begun.

 47 And Aaron took as Moses commanded, and ran into the midst of the congregation; and, behold, the plague was begun among the people: and he put on incense, and made an atonement for the people.

 48 And he stood between the dead and the living; and the plague was stayed.

 49 Now they that died in the plague were fourteen thousand and seven hundred, beside them that died about the matter of Korah.