Video breakdown below.
0:03 - Starting the video you'll see "Odin's Blessing" proc on the buff bar.
0:04 - Ability Piercing Throw cast WITH Odin's buff deals 26.97m damage.
0:05 - Character screen opened to see SA and defense stats listed as 2.07m and 1.97m WITH Odin buff ACTIVE)
0:08 - Gameplay screen returns to show Odin buff has expired.
0:10 - Character screen again to show SA and Defense stats are the same WITHOUT Odin buff active.
0:17 - Piercing Throw deals 54.69m critical damage (27.34m damage without critical 200% multiplier) (Odin buff NOT active)
0:30 - Piercing Throw deals 54.45m critcal damage (27.22m before critical multiplier) (Odin buff NOT active)
0:43 - Piercing throw proc's Odin's Blessing (now ACTIVE) deals 26.89m damage.
0:47 - Character screen to show stats remain unchanged.
0:56 - Piercing Throw procs Sinister buff (increasing damage by 8%) (NO other blessing active) damages for 29.25m damage. (29.25 - 8% = 26.91m damage if buff not present)
-Showing Sinister buff working properly (however is not increased by tier 10 upgrade stating increased effectiveness of tome by 50%)
1:09 - Piercing Throw deals 27.21m damage with NO damage buffs active.
Video clearly shows Odin's blessing is NOT increasing SA whcih would directly increase damage of abilities as stated by the Sunder Armor effect.
"S.A - Higher Sunder Armor leads to increased damage dealt" quoted from charater stat screen.