I designed a pair of experimental d20s called FateFlip.

The white "Good" d20 is mechanically biased toward higher results, while the red "Evil" d20 is mechanically biased toward lower results.

Both dice use an internal design that gives each die 60 display surfaces instead of the 20 faces visible on a standard d20.

To emphasize extreme outcomes, I added special symbols:

White "Good" d20 special features:  
The **Great 20** (chance of 1 to 60 rolls)  
⭐ Radiant Star (chance of 1 to 60 rolls)  
🪽 Angel Wings (chance of 1 to 60 rolls)  
@ Twist of fate (chance of 1 to 60 rolls)

Red "Evil" d20 special features:  
The **Terrible 1** (chance of 1 to 60 rolls)  
💀 Demon Skull (chance of 1 to 60 rolls)  
🗡️ Broken Sword (chance of 1 to 60 rolls)  
@ Twist of fate (chance of 1 to 60 rolls)

The concept was inspired by game effects such as blessings, curses, luck, destiny, divine favor, and misfortune, represented through the die itself rather than through modifiers or rerolls.

These aren't intended to replace a standard d20. I imagine them being used only for special situations where a game calls for unusually good fortune or unusually bad fortune, while ordinary rolls would still use a regular d20.

What game mechanics or RPG situations would you use these dice for?

A pair of d20s with internal probability-shifting mechanisms - the white "Good" die favors high rolls, while the red "Evil" die favors low rolls. Each die has 60 display surfaces. Designed by me.