Here is some info that I have had around since about Luclin or so. It was accurate at the time, so I suspect it still is.
Boleslav
DamageBonus = (Level - 25) / 3
* Damage Bonuses are always rounded down (ie, 7.65 = 7)
(Level) = One Hand | 2 Hand Bonus | Total
(1-27) = 0 | 0 | 0
(2 = 1 | 0 | 1
(29) = 1 | 0 | 1
(30) = 1 | 0 | 1
(31) = 2 | 1 | 3
(32) = 2 | 1 | 3
(33) = 2 | 1 | 3
(34) = 3 | 1 | 4
(35) = 3 | 2 | 5
(36) = 3 | 2 | 5
(37) = 4 | 2 | 6
(3 = 4 | 2 | 6
(39) = 4 | 3 | 7
(40) = 5 | 3 | 8
(41) = 5 | 3 | 8
(42) = 5 | 3 | 8
(43) = 6 | 4 | 10
(44) = 6 | 4 | 10
(45) = 6 | 4 | 10
(46) = 7 | 4 | 11
(47) = 7 | 5 | 12
(4 = 7 | 5 | 12
(49) = 8 | 5 | 13
(50) = 8 | 5 | 13
(51) = 8 | 6 | 14
(52) = 9 | 6 | 15
(53) = 9 | 6 | 15
(54) = 9 | 6 | 15
(55) = 10 | 7 | 17
(56) = 10 | 7 | 17
(57) = 10 | 7 | 17
(5 = 11 | 7 | 18
(59) = 11 | 8 | 19
(60) = 11 | 8 | 19
[DAMAGE BONUSES; Two Hand]
(FAST) IF WeaponDelay <= 27
1.) DamangeBonus = One Handed DamageBonus + 1
* Damage Bonuses are always rounded down (ie, 7.65 = 7).
(MEDIUM) IF WeaponDelay >= 28 AND <= 39
1.) DamageBonus = One Handed DamageBonus + (Level - 27) / 4
(SLOW) IF WeaponDelay >= 40 AND <= 42
1.) DamageBonus = One Handed DamageBonus + ((Level - 27) / 4) + 1
(VERY SLOW) IF WeaponDelay > 42
1.) DamageBonus = One Handed DamageBonus + ((Level - 27) / 4) + (WeaponDelay - 34) / 3
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