[1Co 15:26 NASB] (26) The last enemy that will be abolished is death.
[1Co 15:26 MGNT] (26) ἔσχατος ἐχθρὸς καταργεῖται ὁ θάνατος
The context of 1 Corinthians 15 is a little difficult to sort out, but in 2 Timothy, Paul explicitly says that the abolishment/nullification of death has already occurred in his own lifetime:
[2Ti 1:10 NASB] (10) but now has been revealed by the appearing of our Savior Christ Jesus, who abolished death and brought life and immortality to light through the gospel,
[2Ti 1:10 MGNT] (10) φανερωθεῖσαν δὲ νῦν διὰ τῆς ἐπιφανείας τοῦ σωτῆρος ἡμῶν Χριστοῦ Ἰησοῦ καταργήσαντος μὲν τὸν θάνατον φωτίσαντος δὲ ζωὴν καὶ ἀφθαρσίαν διὰ τοῦ εὐαγγελίου
Is Paul's use of the present aspect intentional and significant or an arcane usage for a future verb?
[Rev 1:18 NASB] (18) and the living One; and I was dead, and behold, I am alive forevermore, and I have the keys of death and of Hades.
[Rev 6:8 NASB] (8) I looked, and behold, an ashen horse; and he who sat on it had the name Death; and Hades was following with him. Authority was given to them over a fourth of the earth, to kill with sword and with famine and with pestilence and by the wild beasts of the earth.
[Rev 20:13-14 NASB] (13) And the sea gave up the dead which were in it, and death and Hades gave up the dead which were in them; and they were judged, every one [of them] according to their deeds. (14) Then death and Hades were thrown into the lake of fire. This is the second death, the lake of fire.
[Eph 4:7-13 NKJV] (7) But to each one of us grace was given according to the measure of Christ's gift. (8) Therefore He says: "When He ascended on high, He led captivity captive, And gave gifts to men." (9) (Now this, "He ascended"--what does it mean but that He also first descended into the lower parts of the earth? (10) He who descended is also the One who ascended far above all the heavens, that He might fill all things.) (11) And He Himself gave some [to be] apostles, some prophets, some evangelists, and some pastors and teachers, (12) for the equipping of the saints for the work of ministry, for the edifying of the body of Christ, (13) till we all come to the unity of the faith and of the knowledge of the Son of God, to a perfect man, to the measure of the stature of the fullness of Christ;