Worked out by the game's own trait code: the boon's first copy at each rarity, then each Pom of Power level, which adds the same amount whatever the rarity and less each time.
Crit Chance
Common
Rare
Epic
Heroic
Level 1
10%
10%
10%
10%
Level 2
20%
20%
20%
20%
Level 3
30%
30%
30%
30%
Level 5
50%
50%
50%
50%
Level 10
100%
100%
100%
100%
Each Pom adds 10%, 10%, 10%, 10%, 10%, 10%, 10%, 10%, 10% (levels 2 to 10).
Common
Rare
Epic
Heroic
Crit Chance at each level and rarity.Show the numbers
Level
Common
Rare
Epic
Heroic
1
10%
10%
10%
10%
2
20%
20%
20%
20%
3
30%
30%
30%
30%
4
40%
40%
40%
40%
5
50%
50%
50%
50%
6
60%
60%
60%
60%
7
70%
70%
70%
70%
8
80%
80%
80%
80%
9
90%
90%
90%
90%
10
100%
100%
100%
100%
Damage
Common
Rare
Epic
Heroic
Level 1
55
63
71
79
Level 2
88
96
104
112
Level 3
111
119
127
135
Level 5
138
146
154
162
Level 10
170
178
186
194
Each Pom adds 33, 23, 16, 11, 8, 6, 6, 6, 6 (levels 2 to 10).