Hello,
I was wondering if anyone has ever tried using the proficency die option in the DMG where you add an extra die to a roll instead of a static bonus. The scaling goes d4 -> d6 -> d8 -> d10 -> d12 instead of 2->3->4->5->6. Expertise would double the dice rolled.
On average, this would increase the die roll by .5. So the average roll is 11+(2,3,4,5,6) at a given proficiency level.
Reading other people's house rule of letting skills be 2d10 instead of 1d20 to reduce the swing, I wonder if it would be too much to allow Expertise to grant a +1 to the skill roll as well.
This allows the Expert to always make a DC 10 in their field. The average roll at level 20 with a 20 in the chosen stat would be: (11.5 from 2d10)+(13 from 2d12)+6 = 30.5. This is from an individual that has reached the peak of mortal ability in attribute and proficiency in a given skill. Compare to the normal variant: (10.5 from d20)+(12 from proficiency)+(5 from attribute bonus) = 27.5. A 3 point difference or about 10% improvement.
I am aware that there is Reliable talent for Rogues and I think Bards gets something like that as well that helps them as well. I see this as helping those that want to use Expertise feats to gain Expertise in other classes.
What is your experience/opinion of the variant, and/or my idea of a house rule?