Let's take for example a falcata and a +3 str mod.
With Vital Strike, you're rolling 1d8+3 (this is multiplied on a crit) + 1d8 (this isn't).
With Mythic Vital Strike, are you rolling 1d8+6 (this is multiplied on a crit) + 1d8 (this isn't), or 1d8+3 (this is multiplied on a crit) + 1d8+3 (this isn't).
On a crit, what's the damage?
Is it 3d8+9 + 1d8+3
Or is it 3d8+18 + 1d8
From how I read mythic vital strike you wouldn't gain anything using a falcata, you're only rolling one d8(from the feat) and multiplying by 1 gives you the same result.
3d8 (falcata)+ 1d8(vital) +9 str.
Once you have improved vital strike the numbers would go up, as you roll more dice (for the feat).
I could be wrong.
I think you are wrong on that part.
Vital strike says 'roll the weapon's damage dice twice', and mythic vital strike says 'the number of weapon damage dice you roll for that feat' not 'the number of extra damage dice you roll for that feat'.
Mythic vital strike lets you multiply the entire (non-extra damage dice) damage code by your vital strike multiplier. It still works like normal vital strike, meaning you don't multiple the vital strike extra stuff by the crit. So if your damage code looked like Mythic Vital Strike +10 (1d8+3 plus 1d6 fire), your damage on a vital strike'd crit would be 2*(1d8+3)+(vital strike: 1d8+3)+1d6 fire = 3d8+9+1d6 fire.
That feels a reasonable interpretation, though I'm not sold on the logic.
'Works like normal vital strike' is just 'these extra weapon damage dice are not multiplied on a critical hit, but are added to the total', not 'extra damage from vital strike is not multiplied on a critical hit'.
It's functionally the same when all you're adding is dice, but when you're adding dice and static damage, it's not.
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Whenever you use Mythic Vital Strike you add all of the bonuses that could be multiplied on a critical (basically your static modifier with a few exceptions) to all the dice you get from Vital Strike
Your falcata would do (1d8+3) + (1d8+3) for the Vital Strike.
A critical would be (3d8+9) + (1d8+3) for the Vital Strike.
It gets pretty ugly when you start adding other bonuses like a magic weapon (bonus is multiplied on a crit), and Power Attack (bonus is multiplied on a crit).
The list is pretty long and gets obnoxious. Soon you have your 16th level Two-Handed (Archetype) Fighter with his double strength Power Attack/ Greater Vital Strike Greatsword dishing out 8d6 + 176
And that's just +6 STR, +4 Gr Wpn Spec, Gr Vital Strike, a +4 weapon, Two Handed Archetype, and Power Attack. We haven't talked about Weapon Training, a Bard, the feat that adds damage based on Vital Strike, Mythic Path abilities, other mythic feats.
I built a kobold fighter out to level 20 and Tier 8 with reasonable gear
He did 12d6+ 412 on a standard hit +57 to attack. With Perfect Strike and Maximized Critical, he had the potential to do 1,634 damage in one blow.
Mythic Vital Strike is silly.
As others have stated… normal damage = 1d8+3, vital strike = 1d8+3+1d8, mythic vital strike = 1d8+3+1d8+3. Crit damage= 3d8+9, VS= 3d8+9+1d8+3, MVS= 3d8+9+1d8+3
I built a kobold fighter out to level 20 and Tier 8 with reasonable gear
He did 12d6+ 412 on a standard hit +57 to attack. With Perfect Strike and Maximized Critical, he had the potential to do 1,634 damage in one blow.
Mythic Vital Strike is silly.
I had a half-Orc bloodrager that was dishing out damage in the same ballpark… hitting around 500 on a normal hit and reaching towards 2,000 on a crit… mythic is insane… mythic vital strike, mythic power attack, and mythic arcane strike are more than a little broken…
Note I forgot falcata was a x3 weapon, but same logic applies, and you would see the / X3 in the dmg code. The end result is that Vital strike is added to the end, because multiple multipliers are added, not multiplied, which is why the vital strike damage, mythic or no, doesn't multiple with a critical, it's just added to the end.