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Heroes' shrines are monuments for Heroes of your realm. They are raised on unused plains. Heroes' shrines attrack traveling heroes, who may decide to follow your cause.
The propability for a heroe to pledge loyalty at a shrine is 1.0 % and increases with every tick by 0.2 % until a heroe appears at the shrine. Afterwards, the shrine belongs to that heroe. If the heroe dies or is dismissed, the propability restarts at 1.0 %.
The higher the expansion level of the shrine, the more experience the hero gains during combat. If the home shrine of a heroe is lost, than the heroe is reassigned to a unoccupied shrine. If there is no unoccupied shrine, then the heroe remains without shrine and doesn't gain any experience in combat any longer.
If a shrine is conquered while a heroe is waiting on that field, the heroe disappears from the map (but is still shown in the unit summary) until another shrine becomes unoccupied. The heroe is then reassigned to that shrine and may be assigned to an army from there.
All heroes start at level 10 and can only rise to higher levels by combat.

Construction time on an empty field	Rebuilding a ruin			Factor for the experience increase of the associated heroe (multiplied with the basic experience gain of the army after combat)
29*	15*			x 75
9*	5*			x 150
9*	5*			x 225
10*	5*			x 300
10*	5*			x 375
10*	5*			x 450
10*	5*			x 525
11*	6*			x 600
11*	6*			x 675
11*	6*			x 750
Constructing a Heroes' shrine atop another kind of ruin: 43*

^{*The provided construction time does not take the research areas "Fatigue Duty" and "Industrial Cooperative" into account!
The cancellation of construction orders is possible at any time. 90 % of the paid ressources are returned.}

Hints from experienced players:

The sooner you have heroes, the stronger your armies will become.
If a heroe appears in your realm those abilities don't quite fit to your game strategy, then do not hesitate to dismiss the heroe. Maybe the next heroe will be a better match.
It is not necessary to send a full army to retrieve a heroe from a shrine. A single horsemen is sufficient and often much faster.