While the troll is still standing, how about Nature and Perception rolls from each of you, as well.
Jhishma and Grok still have actions.
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Perception - (1d20)
(8) = 8
Nature - (1d20+2)
(17) + 2 = 19
Nature Check - (1d20+3)
(8) + 3 = 11
Perception Check - (1d20)
(17) = 17
Attack + damage - (1d20+7, 1d12+7)
1d20+7 : (12) + 7 = 19
1d12+7 : (7) + 7 = 14
Perception - (1d20+4)
(2) + 4 = 6
Nature - (1d20-4)
(13) - 4 = 9
greataxe attack and damage - (1d20+5, 1d12+3)
1d20+5 : (8) + 5 = 13
1d12+3 : (5) + 3 = 8
troll vs Jhishma, bite - (1d20+7, 1d6+4)
1d20+7 : (7) + 7 = 14
1d6+4 : (2) + 4 = 6
troll vs Jhishma, claw - (1d20+7, 2d6+4)
1d20+7 : (8) + 7 = 15
2d6+4 : (35) + 4 = 12
troll vs Jhishma, claw - (1d20+7, 2d6+4)
1d20+7 : (16) + 7 = 23
2d6+4 : (14) + 4 = 9
greataxe attack and damage - (1d20+5, 1d12+3)
1d20+5 : (16) + 5 = 21
1d12+3 : (7) + 3 = 10
Attack - (1d20+8)
(8) + 8 = 16
Damage (collossus slayer) - (1d10+4, 1d8)
1d10+4 : (8) + 4 = 12
1d8 : (7) = 7
Nature - (1d20)
(8) = 8
Perception - (1d20+4)
(20) + 4 = 24
Readied Maul, Adv, Damage, HM - (1d20+6, 1d20+6, 2d6+4, 1d6)
1d20+6 : (7) + 6 = 13
1d20+6 : (20) + 6 = 26
2d6+4 : (41) + 4 = 9
1d6 : (5) = 5
Crit dmg - (2d6)
(63) = 9
Crit HM - (1d6)
(4) = 4
GWF re-roll 1s&2s - (1d6)
(4) = 4
Savage attack - (1d6)
(2) = 2
Attack, damage - (1d20+7, 1d12+7)
1d20+7 : (20) + 7 = 27
1d12+7 : (8) + 7 = 15
Crit damage - (2d12)
(76) = 13