Boons and Banes

This idea is not my idea at all. However, I'm posting this for reference since I'll be mentioning the mechanic in other posts.
If you don't want to use boons and banes, you may

• replace the word "boon" with "bonus of 3" or "advantage"
• replace the word "bane" with "penalty of 3" or "disadvantage."

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Boons and Banes

• Each Bane or Boon is 1D6.
• Banes and Boons cancel each other, so only Banes or only Boons will be added to a roll.

Boons

• When making a D20 roll (only a D20 roll) in an advantageous circumstance, the player gains a Boon. 
• Of all the Boons rolled, the highest number is subtracted from a roll's result.

Banes

• When making a D20 roll (only a D20 roll) in a disadvantageous circumstance, the player gains a Bane.
• Of all Banes rolled, the highest number is added to a roll's result.