Comparison of Armorer, Offense and Archery

At Basic, Advanced or Expert Level, Armorer reduces all damage inflicted by 5%, 10% or 15%.
At Basic, Advanced or Expert Level, Offense increases hand-to-hand damage by 10%, 20% or 30%.
At Basic, Advanced or Expert Level, Archery increases ranged damage by 10%, 25% or 50%.
9 heroes (+ 1 campaign hero Roland) start with Armorer as a secondary skill and 3 specialize in it Mephala, Neela and Tazar.
23 heroes (+ 4 campaign heroes Kilgor, Catherine, Bidley and Tark) start with Offense as a secondary skill and 3 specialize in it Crag Hack, Gundula and Corkes.
9 heroes (+ 1 campaign hero Gelu) start with Archery as a secondary skill and 1 specialize in it Orrin.

Armorer will benefit all your troops while Offense will benefit shooters less (only when they attack in melee).
Archery has the biggest bonus, but only works for shooters.
Inferno, Necropolis and Fortress have 1 shooter, Tower has 3 and all other towns have 2 shooters. Probably, because the Archery applies to fewer stacks in your army, the bonus is bigger to balance the skill.
Beastmasters from Fortress are most likely to learn Armorer (10% chance), followed by Alchemists from Tower (8% chance).
Barbarians from Stronghold are most likely to learn Offense (10% chance), followed by Captains from Cove (9% chance).
Captains from Cove are most likely to learn Archery (9% chance), followed by Rangers from Rampart and Planeswalkers from Conflux (8% chance).

Assuming Expert Level in the secondary skill, the bonus will increase to the following values at certain levels:

Bonus Percentages from Specialty
	Armorer	Offense	Archery
Base %	15%	30%	50%
Level
0	15%	30%	50%
1	16%	32%	53%
2	17%	33%	55%
3	17%	35%	58%
4	18%	36%	60%
5	19%	38%	63%
10	23%	45%	75%
15	26%	53%	88%
20	30%	60%	100%
25	34%	68%	113%
30	38%	75%	125%
40	45%	90%	150%
46	50%	99%	165%
47	50%	101%	168%
50	53%	105%	175%
60	60%	120%	200%
70	68%	135%	225%
73	70%	140%	233%
74	71%	141%	235%

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