My group and I use this variation on damage in our campaigns. We weren't happy with the static damage that 13th Age monsters, so we converted it to dice rolls. This was a simple conversion.

We rounded down the damage to the nearest common die. We then would add the difference between the two numbers as a modifier.
This modifier is optional, but then the monsters you encounter will never be as powerful as they were before.

13th Age Variable Damage  Conversion Table Variable Damage Equivalents
Orig.
Dmg
Dice
Roll
Mod*
(+)
Orig.
Dmg
Dice
Roll
Mod*
(+)
Orig.
Dmg
Dice
Roll
Mod*
(+)
Orig.
Dmg
Dice
Roll
Mod*
(+)
1 - 1 26 1d20
+1d6
- 51 2d20
+1d10
1 76 3d20
+1d12
+1d4
-
2 - 2 27 1d20
+1d6
1 52 4d10
+1d12
- 77 3d20
+1d12
+1d4
1
3 - 3 28 1d20
+1d8
- 53 4d10
+1d12
1 78 3d20
+1d12
+1d6
-
4 1d4 - 29 1d20
+1d8
1 54 2d20
+1d10
+1d4
- 79 3d20
+1d12
+1d6
1
5 1d4 1 30 1d20
+1d10**
- 55 2d20
+1d10
+1d4
1 80 4d20 -
6 1d6 - 31 1d20
+1d10
1 56 2d20
+1d10
+1d6
- 81 4d20 1
7 1d6 1 32 1d20
+1d12
- 57 2d20
+1d10
+1d6
1 82 3d20
+1d12
+1d10
-
8 1d8 - 33 1d20
+1d12
1 58 2d20
+1d10
+1d8
- 83 3d20
+1d12
+1d10
1
9 1d8 1 34 1d20
+1d10
+1d4
- 59 2d20
+1d10
+1d8
1 84 4d20
+1d4
-
10 1d10 - 35 1d20
+1d10
+1d4
1 60 3d20 - 85 4d20
+1d4
1
11 1d10 1 36 1d20
+1d10
+1d6
- 61 3d20 1 86 4d20
+1d6
-
12 1d12 - 37 1d20
+1d10
+1d6
1 62 3d20 2 87 4d20
+1d6
1
13 1d12 1 38 1d20
+1d10
+1d8
- 63 3d20 3 88 4d20
+1d8
-
14 1d12 2 39 1d20
+1d10
+1d8
1 64 3d20
+1d4
- 89 4d20
+1d8
1
15 1d12 3 40 2d20 - 65 3d20
+1d4
1 90 4d20
+1d10
-
16 1d12
+1d4
- 41 2d20 1 66 3d20
+1d6
- 91 4d20
+1d10
1
17 1d12
+1d4
1 42 3d10
+1d12
- 67 3d20
+1d6
1 92 4d20
+1d12
-
18 1d12
+1d8
- 43 3d10
+1d12
1 68 3d20
+1d8
- 93 4d20
+1d12
1
19 1d12
+1d8
1 44 2d20
+1d4
- 69 3d20
+1d8
1 94 4d20
+1d12
2
20 1d20 - 45 2d20
+1d4
1 70 3d20
+1d10
- 95 4d20
+1d12
3
21 1d20 1 46 2d20
+1d6
- 71 3d20
+1d10
1 96 4d20
+1d12
+1d4
-
22 1d20 2 47 2d20
+1d6
1 72 3d20
+1d12
- 97 4d20
+1d12
+1d4
1
23 1d20 3 48 2d20
+1d8
- 73 3d20
+1d12
1 98 4d20
+1d12
+1d6
-
24 1d20
+1d4
- 49 2d20
+1d8
1 74 3d20
+1d12
2 99 4d20
+1d12
+1d6
1
25 1d20
+1d4
1 50 2d20
+1d10
- 75 3d20
+1d12
3 100 *** -
                         
  *=Optional                    
  **=Can use 1d30 instead.
  ***=5d20 or 10d10 or 1d% + 1d10
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