The damage should still trigger a Concentration check though. Unless 20 missed!
Rolls
Thunder Cannon, 2d6+4 piercing, 2d6 thunder - (1d20+6, 2d6+4, 2d6)
1d20+6 : (8) + 6 = 14
2d6+4 : (64) + 4 = 14
2d6 : (61) = 7
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Thunder Cannon, 2d6+4 piercing, 2d6 thunder - (1d20+6, 2d6+4, 2d6)
1d20+6 : (8) + 6 = 14
2d6+4 : (64) + 4 = 14
2d6 : (61) = 7
Concentration - (1d20+2)
(12) + 2 = 14
Concentration - (1d20+2)
(19) + 2 = 21
Crossbow attack - (1d20+5)
(15) + 5 = 20
Damage if Applicable - (1d6+3)
(4) + 3 = 7
long bow attack - (1d20+5)
(14) + 5 = 19
Damage if Applicable - (1d8+3)
(2) + 3 = 5
Death save - (1d20)
(14) = 14
Death Save - (1d20)
(6) = 6
Spell attack - (1d20+8)
(16) + 8 = 24
Damage if Applicable - (4d10)
(10557) = 27
Perception, Guidance - (1d20+7, 1d4)
1d20+7 : (14) + 7 = 21
1d4 : (4) = 4
Perception - (1d20+1)
(13) + 1 = 14
Stealth - (1d20+4)
(15) + 4 = 19