TheCosmicKid
Hero
More like...Do you mean something like..
At the start of each of your turns, Roll 5d6, and select one of the following options, the bonus lasts until the start of your next turn.
*You get a bonus to-hit equal to number of 1's rolled.
*You get a bonus to AC equal to the number of 2's rolled.
*You get a bonus to your saving throws equal to the number of 3's rolled.
...
*If all 5 numbers are the same, replace any d20 roll you make turn with a natural 20.
At level 5, you can spend your bonus action to reroll any of the dice. You must use this before taking any other action.
At level 11, you can select 2 different options, gaining both bonuses.
At some point, possibly at the start of each of your turns, possibly less often, roll 5d6.
As an action, you can spend three even dice to perform the Gruesome Disemboweling Strike, which may do something based on the numbers on the dice.
As an action, you can spend two even dice to perform the Stab of Extreme Discomfort.
As a reaction when a creature attacks you, you can spend three odd dice to perform the Contemptuously Easy Parry.
As a bonus action, you can spend two odd dice to enter the Stance of the Paranoid Turtle.
...and so on. With, yes, various ways to manipulate and reroll your dice.