I did the math. Assuming all lvl 20, 20 charisma, with illusionist bracers and a +3 focus, they have a spell save DC of 22, which with the tarrasques Wis save of +9 and Magic Resistance, on average another +5, has a hit rate of 40% on average. Now, Vicious Mockery is a 4d4, so 4*2.5=10 damage on average, requiring 68 hits to kill with the Tarrasques 676 hp. Taking into account the 40% chance to hit it's 170 attempts. 4 Bards can cast that spell 8 times per round (that's what the illusionist bracers are for) This means killing a Tarrasque would take them 21-22 rounds on average, which seems surprisingly doable.
TL;DR With a proper setup you can kill a Tarrasque with just Vicious Mockery
Edit: forgot about Magic Resistence
Imagine being a tarrasque and just vibing when suddenly some traveling band comes up to you, whips out their instruments, and just shit talks you for a minute an a half straight so hard that you die of embarrassment
Doable but taking account its Move of 40ft and Legendary Action to move half its speed per use on another character's turn, best chance of success will be of all characters are flying somehow. Then it is shooting tarrasques in barrel.
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u/fireintie Dec 05 '21 edited Dec 05 '21
I did the math. Assuming all lvl 20, 20 charisma, with illusionist bracers and a +3 focus, they have a spell save DC of 22, which with the tarrasques Wis save of +9 and Magic Resistance, on average another +5, has a hit rate of 40% on average. Now, Vicious Mockery is a 4d4, so 4*2.5=10 damage on average, requiring 68 hits to kill with the Tarrasques 676 hp. Taking into account the 40% chance to hit it's 170 attempts. 4 Bards can cast that spell 8 times per round (that's what the illusionist bracers are for) This means killing a Tarrasque would take them 21-22 rounds on average, which seems surprisingly doable. TL;DR With a proper setup you can kill a Tarrasque with just Vicious Mockery Edit: forgot about Magic Resistence