https://discord.gg/TpZ8nNN4P4

Probability

Unlikely 1

1

2

3

4

5

Possible 2

2

4

6

8

10

Somewhat  likely 3

3

6

9

12

15

Likely 4

4

8

12

16

20

Outcome: 

Minor or no damage, first aid injuries

1

Easily repaired damage, recoverable injuries 2

Heavy damage, life-threatening injuries 3

Fatality, localized destruction 4

Multiple fatalities, widespread destruction 5