The Realm does not affect the Hero or the troops, but affect the cities and mines, like merchant deals, amount of resources spent for building a structure, capturing/destroying enemy mines.
Warfare affects troops passive way. Among Warefare abilities, there are abilities for extra Hit Points for the troops, extra ranged damage and some amazing feats.
Magic[]
All Magic skills can be used once per turn (some are passive, however). There are 7 sub-categories of Magic abilities.
Protect your forces with ice and bring your enemies a cold death.
Heroic[]
The heroic abilities depend on the faction, but have universal abilities, for example the specializations (one of the types of the passive starting abilities). The Heroic Strike the Hero's base attack, while the Faction Ability is an unique ability of the faction. The Hero's affinity (Might or Magic) is not attached to by these two types. The last heroic ability type is the Reputation Ability, and that the Main Hero's affinity and his reputation (Blood or Tears) are attached to by him.
The Hero attacks mark a target enemy creature stack as an "Offering" for 3 turns. The marked stack dealt 10 Darkness damage every time it is about to do an action for 3 turns. Moreover, the faction gauge fills by 20 points every time the target is attacked by a friendly stack. Only one creature can be marked at a time.
Target friendly Dungeon creature stack become invisible. It is revealed when it attacks an enemy or when it becomes adjacent to an enemy stack. When invisible, the stack causes 10% additional damage, avoids retaliation, and received 50% less damage, bonus Movement. The level of the ability defines the possible creature type and the bonus Movement.
The Hero's attacks brand the target enemy as a heretic. All the Hero's creatures deal X% (based on the Hero's level) increased damage to the marked stack. Only one stack can be marked at the same time.
Target friendly Core stack becomes impervious to all harm for 1 turn(s). It is possible to select stronger creature types on higher levels.
Inferno heroes know in advance whether their default attacks will be critical hits. Might increases the damage bonus of the critical hits.
Select one of your demon stacks and then an area to summon a stack of demons of the same type. It is possible to select stronger creature types on higher levels.
The Hero's attacks mark the creature with Soulreaver for 3 turn. If a stack dies under the effect of Soulreaver, then the Hero gets 20 Necromancy Points. Constructs are not affected.
Raises friendly undead creatures based on the size of your army. It is possible to raise stronger creature types on higher levels.