Rolls
Arcana Check - (1d20+5)
(10) + 5 = 15
Maul & dammage - (1d20+5, 2d6+3)
1d20+5 : (19) + 5 = 24
2d6+3 : (14) + 3 = 8
Advantage (if applicable) - (1d20+5)
(12) + 5 = 17
GWF re-roll 1s&2s - (1d6)
(3) = 3
greataxe attack and damage with advantage - (1d20+5, 1d20+5, 1d12+3)
1d20+5 : (14) + 5 = 19
1d20+5 : (13) + 5 = 18
1d12+3 : (2) + 3 = 5
great weapon fighting re-roll for damage - (1d12+3)
(11) + 3 = 14
Sacred Flame (vulnerable) - (1d20+5, 1d8)
1d20+5 : (16) + 5 = 21
1d8 : (5) = 5
Attack, advantage roll and Damage: Greataxe - (1d20+6, 1d20+6, 1d12+4)
1d20+6 : (9) + 6 = 15
1d20+6 : (11) + 6 = 17
1d12+4 : (3) + 4 = 7
Claws, psychic damage - (1d20+5, 2d6+3)
1d20+5 : (17) + 5 = 22
2d6+3 : (34) + 3 = 10
Sacred Flame (vulnerable), Dex save - (1d20+5)
(6) + 5 = 11
Sacred Flame (vulnerable) - (1d8)
(4) = 4
Claws, psychic damage, disadvantage - (1d20+5)
(3) + 5 = 8
Attack, advantage roll and Damage: Greataxe - (1d20+6, 1d20+6, 1d12+4)
1d20+6 : (20) + 6 = 26
1d20+6 : (11) + 6 = 17
1d12+4 : (3) + 4 = 7
Critical hit extra damage dice - (1d12)
(6) = 6
greataxe attack and damage - (1d20+5, 1d12+3)
1d20+5 : (14) + 5 = 19
1d12+3 : (1) + 3 = 4
great weapon fighting re-roll for damage - (1d12+3)
(1) + 3 = 4
Wis save v suggestion? - (1d20+4)
(10) + 4 = 14
Maul & dammage - (1d20+5, 2d6+3)
1d20+5 : (17) + 5 = 22
2d6+3 : (13) + 3 = 7
GWF re-roll 1s&2s - (1d6)
(3) = 3
Attack, advantage and damage: Greataxe - (1d20+6, 1d20+6, 1d12+4)
1d20+6 : (4) + 6 = 10
1d20+6 : (1) + 6 = 7
1d12+4 : (2) + 4 = 6