12
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  1. Any proficient ability check d20 roll of lower than 10 is set to 10 with the Reliable Talent rogue feature.
  2. +17 from the Expertise rogue feature (12 + ability modifier of +5).
  3. +a minimum of 1 from the guidance cantrip.
  4. +5 from the Flash of Genius artificer feature with 20 Int:

    Flash of Genius

    Starting at 7th level, you gain the ability to come up with solutions under pressure. When you or another creature you can see within 30 feet of you makes an ability check or a saving throw, you can use your reaction to add your Intelligence modifier to the Roll.

    You can use this feature a number of times equal to your Intelligence modifier (minimum of once). You regain all expended uses when you finish a long rest.

= 33? Am I stacking these right?

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  • \$\begingroup\$ Given some of the answers that have come in, it may be worth emphasising that you are not looking for an optimization, but a check on feature stacking. The title can be interpreted to be a char-opt start. \$\endgroup\$ – Someone_Evil Mar 12 at 12:35
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Yes

You've done all the math and that's correct. Of course, you need to be using a skill check in which you're proficient, but you are a 20th level PC and built it in such a way to maximize the skill check possibilities.

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No. You can increase the minimum value more.

To further optimise your minimum value a bit more, you could have a bardic inspiration for a minimum of +1, and be a hobgoblin with 5 people watching you do said task. That would give you a +5 bonus from their Saving Face ability if you fail with your initial roll. This gives you a minimum value of 39.

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  • 3
    \$\begingroup\$ The question is "Is 33 the minimum result?", not "How high can I get it?" \$\endgroup\$ – Mark Wells Mar 11 at 3:29
  • \$\begingroup\$ While I wasn't asking for additional methods to raise the minimum, this is interesting nonetheless. After all a 11/9 rogue/artificer could be a hobgoblin. However this is probably best discussed in chat. \$\endgroup\$ – kent Mar 11 at 7:49

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