The Trio of goblins sees the attack on Yeemick and they all charge forward towards the group.
This triggers an attack of opportunity for Seron on G1 or G5 as he was able to slip his hands free of their bonds without anyone taking notice.
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Unarmed strike - (1D20)
(4) = 4
Punch damage - (1D2)
(1) = 1
G1 scimitar/slashing - (1D20+4, 1d6+2)
1D20+4 : (7) + 4 = 11
1d6+2 : (4) + 2 = 6
G4 scimitar/slashing - (1D20+4, 1d6+2)
1D20+4 : (18) + 4 = 22
1d6+2 : (1) + 2 = 3
G5 scimitar/slashing - (1D20+4, 1d6+2)
1D20+4 : (17) + 4 = 21
1d6+2 : (2) + 2 = 4
Short sword/piercing - (1D20+5, 1d6+3)
1D20+5 : (4) + 5 = 9
1d6+3 : (5) + 3 = 8
Bonus action sword attack/ piercing - (1D20+5, 1d6)
1D20+5 : (1) + 5 = 6
1d6 : (3) = 3
Bludgeoning Damage to Sildar - (1D6)
(5) = 5
Athletics to get free dc15 - (1D20+1)
(19) + 1 = 20
Firebolt attack - (1D20+4)
(19) + 4 = 23
Firebolt attack Dis - (1D20+4)
(11) + 4 = 15
Damage if hit - (1D10)
(3) = 3
Dex save; DC 13 or X cold - (1d8)
(4) = 4