I honestly expected that someone would ask why I jumped from 1d12, to 2d20, etc.  My rationale wasn't about chasing percentages.  It was about chasing fun.  People aware of D&D 5E, are aware of Advantage / Disadvantage.  I made the jump from 1d12, to 2d20, etc.; as a conscious emphasis on the "Advantage" of Training and Experience.

An Untrained (Neophyte) at a specific task or skill, rolls 1d12 to determine their possible success.  This excludes a lucky roll from allowing them to succeed at Very Difficult (15), or Extremely Difficult (20) tasks.

A Trained (Apprentice) rolls 2d20.  This shows how important Training and Experience are, very quickly.

Then you add an additional d20, as you continue to improve at a specific task or skill.

As the DM / GM, my pacing wouldn't allow players to quickly achieve Expert, Master, or Legendary proficiency.  They'd have to earn it.

Quote from: Razor 007;1123507That seems to show that 5D20, keep 1; is better for a Legendary character, than 6D10, keep 2?

It certainly means that a Legendary Character is more likely to succeed on a Legendary task - at least, if that is what a TN 20 means.  

As Proposed:

Untrained (Neophyte), roll One D12
TN 5 67%/TN 10 25%/TN 15 0%/TN 20 0%

Trained (Apprentice), roll Two D20's
TN 5 96%/TN 10 80%/TN 15 51%/TN 20 10%

Expert (Skilled), roll Three D20's
TN 5 99%/TN 10 91%/TN 15 66%/TN 20 14%

Master (Highly Skilled), roll Four D20's
TN 5 100%/TN 10 96%/TN 15 76%/TN 20 19%

Legendary (The Chosen One), roll Five D20's
TN 5 100%/TN 10 98%/TN 15 83%/TN 20 23%

To me, it seems like it doesn't really make sense to require a roll at certain points.  

To me, it's easier to say:
If you're Trained or Better, you automatically succeed on any 'Fairly Easy' Task.
If you're Master or Better, you automatically succeed on any 'Moderately Difficult Task'

If you don't auto-succeed due to your training, you could just roll the d20+Mods as standard D&D.

Fairly Easy doesn't mean automatic.  It is Fairly Easy, but there is some slight chance of failure.

"Easy" however, wouldn't require a roll at all.

Examples of tasks that wouldn't require any roll at all:

Taking a drink of water at room temperature.
Breathing, under normal circumstances.
Taking your shoes off.
Urinating.
Etc.

No roll required for that kind of stuff.

Quote from: Razor 007;1123555Examples of tasks that wouldn't require any roll at all:

Urinating.


No roll required for that kind of stuff.

Well, not until your prostate objects.

Quote from: HappyDaze;1123557Well, not until your prostate objects.

Getting old isn't much fun....

Quote from: Razor 007;1123563Getting old isn't much fun....

Hey, at least you get another opportunity to roll the dice!