Here is the breakdown for Threads and Merits...
Every 3rd veteran level through 99, you will receive a veteran badge and a number of Empyrean Merits. The number of Empyrean Merits starts at 20 and decreases by 5 after every 25 veteran levels. After veteran level 99, you will no longer receive Empyrean Merits as veteran rewards.
The full breakout for veteran reward Empyrean Merits is below:
3 to 24: 20 Empyrean Merits ( 3, 6, 9, 12, 15, 18, 21, 24 = 160 Empyrean Merits)
27 to 48: 15 Empyrean Merits (27, 30, 33, 36, 39, 42, 45, 48 = 120 Empyrean Merits)
51 to 75: 10 Empyrean Merits (51, 54, 57, 60, 63, 66, 69, 72, 75 = 90 Empyrean Merits)
78 to 99: 5 Empyrean Merits (78, 81, 84, 87, 90, 93, 96, 99 = 40 Empyrean Merits)
---------------------------
total = 410 Empyrean Merits
Every veteran level through 11 that you do not receive Empyrean Merits, you will receive 120 Incarnate Threads. After veteran level 11, you will no longer receive Incarnate Threads as veteran rewards.
The full breakout for veteran reward Incarnate Threads is below:
1 to 11: 120 Incarnate Threads ( 1, 2, 4, 5, 7, 8, 10, 11 = 960 Incarnate Threads)
---------------------------
total = 960 Incarnate Threads