8 5 12 16 13 5 20 8 9 19 19 20 18 1 14 7 5 5 14 20 9 20 25 3 1 12 12 5 4 14 9 20 8 9 14 11 9 20 13 5 1 14 19 14 15 19 20 18 9 12 9 6 9 13 3 15 18 18 5 3 20 8 5 8 5 19 20 18 25 9 14 7 20 15 1 20 20 1 3 11 13 5 23 9 20 8 2 12 1 3 11 13 1 7 9 3 1 14 4 9 4 15 14 20 20 8 9 14 11 9 6 9 3 1 14 19 20 1 14 4 12 15 14 7 5 18 https://cryptii.com/pipes/a1z26-cipher
A series of cryptic messages to decode future puzzle until the end of the “boom sep” chain?