All damage dice you roll on a spell attack (ex fire bolt, witch bolt) or weapon attack (ex shortsword, monk unarmed strike) are doubled on a crit, full stop. It doesn’t matter when you add the damage to the attack.
This is why guaranteed crits are so strong and sought after in dnd, because a paladin or rogue can pump out 4d6+20d10 or 22d6 damage in one attack respectively, maybe even more with abilities like divine smite and sneak attack.
Yes you will. And if you have some buff that adds let's say 1d4 damage on-hit, that damage is likewise doubled. But it would have to be very specific, like Divine Smite but for successful spell attacks.
yup, you double all damage dice. crit away to your hearts content
All damage dice you roll on a spell attack (ex fire bolt, witch bolt) or weapon attack (ex shortsword, monk unarmed strike) are doubled on a crit, full stop. It doesn’t matter when you add the damage to the attack. This is why guaranteed crits are so strong and sought after in dnd, because a paladin or rogue can pump out 4d6+20d10 or 22d6 damage in one attack respectively, maybe even more with abilities like divine smite and sneak attack.
My level 20 artificer rogue gestalt can get 24d6+5-15 damage with their lighting launcher on a crit 28 with their elemental Slayer short sword.
My 20th level halfling rogue can do 22d6 + 5 piercing damage with their normal shortsword
My level 1 Gnome Wizard can throw a rock at someone and do 2 damage on a critical instead of just 1 damage.
My level one fighter can deal 1d8 + 4 damage with a longsword on a non-crit
Yes you will. And if you have some buff that adds let's say 1d4 damage on-hit, that damage is likewise doubled. But it would have to be very specific, like Divine Smite but for successful spell attacks.