Below you could find full described list of those objects.
Only once used for a hero
Stone of Enlightment
Gives 2500 XP.
Hero can use it only once
Shrine of the Seventh Dragon
Level up a hero for a sufficient payment.
After fight all lost troops are resurrected.
Revelation Crystal
Gives +1 to magic defence permanently.
Only one-shot for hero
Armoursmith
Gives +1 to might defence permanently.
Only one-shot for hero
Increase hero’s morale about random number.
you could use it only once per battle
Blind maiden
+5 to hero’s destiny.
it’s possible for you to use it only once per battle.
Reverie Shrine
You get bonus +10 to initiative and +5 to might attack.
Only once per battle
Dragon Vein
Completely regenerate mana points.
Only once per week.
Dragon Nexus
Doubled maximum mana points.
Only once per week
Stables
+5 to movement points.
Only once per battle
Sigil of Arrkath
+5 to magic defence for a week.
Hero can use it once per week.
Hell Forge
+5 to might power and magic power for a week.
Hero can use it once per week.
Raiders Dwelling
Gives some gold for every won battle.
Amount of gold depends from numbers of such structures you control.
Centaur statue
Gives additional +5 to movement points and increase distant damages by 10% for a week.

Hero can use it once per week.
Ice Pearl Shrine
+10 to the initiative to the end of current week.
One use for a week
Angels Shrine
+5 to magic power and Leadership do the end of current week.
One use per a week.
Chorus
+5 to Leadership and magic power to the next battle.
you’ve got the option to use it once per battle.
Knight Shrine
+1 to unit’s movement radius and +5 to the morale for a week.
Hero can use it once per seven turns.
Demons Shrine
+5 to might power and luck for a week.
you might use it once per week.
you might use it once per fight.
Water Elemental Shrine
If friendly units get damaged, they will obtain ice armor spell.
Souls Well
+10 to hero’s magic power to the end of a week.
you might use it once per week.
Chaos Wave
During next battle on your side appears computer controlled monster.
It starts eating random enemy units (it can be interrupted by killing a beast).
you might use it once per week.
Altair of Destruction
In the next battle your enemy will be attacked by meteors.
you’re able to use it once per week.
This site is not associated with and/or endorsed by the Ubisoft or Black Hole Games.
All logos and images are copyrighted by their respective owners.