Spoiler: attacks, saves
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Dissonant Whispers (2nd level)
save wis DC 17 (1d20)[10]+? to half dmg and not move away
dmg (4d6)[13]
Scathach's owl distracts
If fail:
opportunity attacks TREX
Fjallar trex attack
bite (1d20+10)[23], if adv owl: (1d20+10)[28]
Dmg (4d12+7)[35] if crit: (4d12)[23]
opportunity attacks V
V1
Bite (1d20+4)[24], (1d20+4)[24]
Dmg (1d6+2)[4] if crit: (1d6)[4]
V2
Bite (1d20+4)[22], (1d20+4)[11]
Dmg (1d6+2)[7] if crit: (1d6)[2]
V3
Bite (1d20+4)[6], (1d20+4)[17]
Dmg (1d6+2)[4] if crit: (1d6)[5]
V4
Bite (1d20+4)[12], (1d20+4)[23]
Dmg (1d6+2)[8] if crit: (1d6)[1]
V5
Bite (1d20+4)[13], (1d20+4)[11]
Dmg (1d6+2)[7] if crit: (1d6)[6]
V6
Bite (1d20+4)[19], (1d20+4)[13]
Dmg (1d6+2)[7] if crit: (1d6)[5]
V7
Bite (1d20+4)[5], (1d20+4)[13]
Dmg (1d6+2)[7] if crit: (1d6)[4]
V8
Bite (1d20+4)[21], (1d20+4)[19]
Dmg (1d6+2)[5] if crit: (1d6)[5]
V12
Bite (1d20+4)[19], (1d20+4)[17]
Dmg (1d6+2)[5] if crit: (1d6)[4]
V13
Bite (1d20+4)[23], (1d20+4)[6]
Dmg (1d6+2)[8] if crit: (1d6)[1]
V14
Bite (1d20+4)[18], (1d20+4)[8]
Dmg (1d6+2)[7] if crit: (1d6)[1]
V15
Bite (1d20+4)[6], (1d20+4)[20]
Dmg (1d6+2)[3] if crit: (1d6)[3]
V16
Bite (1d20+4)[6], (1d20+4)[22]
Dmg (1d6+2)[5] if crit: (1d6)[6]
(1d20+7)[13], (1d20+7)[11], (1d20+7)[21]
dmg: (1d6+16)[18], if crit: (1d6)[4]
(1d20+7)[14], (1d20+7)[26], (1d20+7)[15]
dmg: (1d6+16)[17]if crit: (1d6)[2]
bonus:
(1d20+7)[11], (1d20+7)[23], (1d20+7)[27]
dmg: (1d6+16)[20], if crit: (1d6)[3]
haste:
(1d20+7)[25], (1d20+7)[20], (1d20+7)[12]
dmg: (1d6+16)[22]if crit: (1d6)[2]
Fjallar Attack
Fjallar trex attack
bite (1d20+10)[18], adv owl: (1d20+10)[24]
Dmg (4d12+7)[30] if crit: (4d12)[28]
V1
Bite (1d20+4)[11], (1d20+4)[15]
Dmg (1d6+2)[6] if crit: (1d6)[1]
Claws (1d20+4)[21], (1d20+4)[7]
Dmg (1d4+2)[4] if crit: (1d4)[4]
V2
Bite (1d20+4)[15], (1d20+4)[12]
Dmg (1d6+2)[3] if crit: (1d6)[5]
Claws (1d20+4)[7], (1d20+4)[5]
Dmg (1d4+2)[4] if crit: (1d4)[2]
V3
Bite (1d20+4)[23], (1d20+4)[22]
Dmg (1d6+2)[7] if crit: (1d6)[5]
Claws (1d20+4)[8], (1d20+4)[6]
Dmg (1d4+2)[4] if crit: (1d4)[2]
V4
Bite (1d20+4)[16], (1d20+4)[23]
Dmg (1d6+2)[8] if crit: (1d6)[4]
Claws (1d20+4)[13], (1d20+4)[9]
Dmg (1d4+2)[6] if crit: (1d4)[4]
V5
Bite (1d20+4)[20], (1d20+4)[14]
Dmg (1d6+2)[7] if crit: (1d6)[4]
Claws (1d20+4)[16], (1d20+4)[6]
Dmg (1d4+2)[4] if crit: (1d4)[1]
V6
Bite (1d20+4)[14], (1d20+4)[13]
Dmg (1d6+2)[7] if crit: (1d6)[4]
Claws (1d20+4)[13], (1d20+4)[6]
Dmg (1d4+2)[3] if crit: (1d4)[2]
V7
Bite (1d20+4)[23], (1d20+4)[21]
Dmg (1d6+2)[4] if crit: (1d6)[1]
Claws (1d20+4)[23], (1d20+4)[18]
Dmg (1d4+2)[5] if crit: (1d4)[2]
V8
Bite (1d20+4)[16], (1d20+4)[15]
Dmg (1d6+2)[3] if crit: (1d6)[6]
Claws (1d20+4)[19], (1d20+4)[24]
Dmg (1d4+2)[5] if crit: (1d4)[2]
V12
Bite (1d20+4)[14], (1d20+4)[15]
Dmg (1d6+2)[3] if crit: (1d6)[1]
Claws (1d20+4)[17], (1d20+4)[12]
Dmg (1d4+2)[3] if crit: (1d4)[1]
V13
Bite (1d20+4)[20], (1d20+4)[24]
Dmg (1d6+2)[7] if crit: (1d6)[2]
Claws (1d20+4)[5], (1d20+4)[21]
Dmg (1d4+2)[5] if crit: (1d4)[4]
V14
Bite (1d20+4)[17], (1d20+4)[19]
Dmg (1d6+2)[3] if crit: (1d6)[4]
Claws (1d20+4)[12], (1d20+4)[17]
Dmg (1d4+2)[3] if crit: (1d4)[4]
V15
Bite (1d20+4)[7], (1d20+4)[7]
Dmg (1d6+2)[8] if crit: (1d6)[6]
Claws (1d20+4)[6], (1d20+4)[18]
Dmg (1d4+2)[4] if crit: (1d4)[3]
V16
Bite (1d20+4)[8], (1d20+4)[12]
Dmg (1d6+2)[6] if crit: (1d6)[5]
Claws (1d20+4)[19], (1d20+4)[19]
Dmg (1d4+2)[6] if crit: (1d4)[2]
Erupting earth at 3rd:
dex save dc 16 for half (1d20)[14]+?
dmg (3d12)[25]
Results. Assuming nothing interferes:
If opportunity:
Fjallar: 35
Velociraptor: 41
Scathach:
13 or 6 dmg depending on save
Ghislaine:
77 dmg
Fjallar
30 dmg
Veliciraptor:
47 dmg
erupting earth: 25 or 12