See augment for how to increase the base value of your hero's stats.
Life (a.k.a Health, Hit Points) is a measure of the damage the hero can absorb. It is affected by Armor and Outfits.
Strength increases attack damage of the hero (given as a min/max pair of numbers). It is affected by Weapons and Outfits.
Intelligence EditIntelligence increases skill damage (every 100 intelligence gives hero skills 1% effect). It is affected by Helmets and Outfits.
Agility increases attack speed. It is affected by Amulets. By running some experiments, it has been found that each 200 agility increases a hero's attack speed by 5%. (thanks to soltys13 and popington, on AG).
Each 40 agility increases a hero's attack speed by 1%
Armor reduces physical damage taken (but not magic damage). Can be affected by skills, talents and technology in castle, but not by augmenting or equipment.
Every 100 points increases 1% armor.
Low: 1% - 20%
Medium: 21% - 50%
Heavy: 51% - 80%
Beefy: over 80%
Barracks soldiers have the following base armor values:
Other upgrades (Gladiators, Clergymen) and Heroes have no base armor.