Let’s make Heroes 4 better.

1. Wrestling Pits and Arena of Honor provide a +10% bonus to the attack and defense of all monsters belonging to the owner of these buildings. The cost of Wrestling Pits and Arena of Honor is 2000 gold and 6 ore. The buildings have a cumulative effect: 1 city - 10%, 2 cities - 21%, 3 cities - 33%... Calculated using the classic formula: Attack*(1+1.1)*(1+1.1)*(1+1.1)...

2. Magic dampener provides 20% magic resistance for Strength monsters and 10% magic resistance for other monsters belonging to the owner of this building. The cost of Magic dampener is 3000 gold and 10 ore. The building has a cumulative effect: 1 city - 20%(10%), 2 cities - 36%(19%), 3 cities - 49%(27%)... Calculated using the classic formula: 1-(1-0.2)*(1-0.2)*(1-0.2) for Strength monsters and 1-(1-0.1)*(1-0.1)*(1-0.1) for other monsters...

3. New arsenal. Its cost is 4000 gold, 6 wood, 6 ore, and 3 units of other resources.
Unnecessary items have been removed: Axe, Leather, Shield, Potion of quickness, Potion of Restoration.
The new arsenal can contain Long sword, Potion of immortality, Potion of endurance, and Vial of acid, 2 random Treasures, and 3 random Scrolls (1 lvl, 2 lvl, and 3 lvl).

2 random Treasures are determined on the day the building is constructed, excluding: Cap of Knowledge, Wizards’s Ring, Badge of Courage, Cart of Ore, Cart of Lumber, Viewing Crystal, Sextant, Breeze the falcon, Bag of gold, and Purse of gold.

Magical artifacts, artifacts that provide resources, and artifacts that affect the global map have been excluded.

3 random Scrolls are determined on the day the building is constructed, excluding:
Sparks, Fire Aura, Magic Arrow, Fire Bolt, Magic Mirror, Fire ring, Fireball, Lightning (chaos spells);
Unholy Song, Life Drain, Plague, Life Ward (death spells);
Holy Word, Summon Ship, All wards, Holy Shout (life spells);
Magic fist, Visions, Ice bolt, Banish (order spells);
All Summon creatures, Necromancy Ward (nature spells).

Castle-specific magic and damage spells have been excluded.

The prices are as follows:
Treasure - 2000 gold.
Scroll 1 lvl - 1000 gold.
Scroll 2 lvl - 2000 gold.
Scroll 3 lvl - 3000 gold.

The prices of scrolls are four times higher than the prices of corresponding-level reagents: 1 lvl - 4*250, 2 lvl - 4*500, 3 lvl - 4*750.

4. Due to the increased cost of the proposed buildings, the cost of Breeding Pens has been reduced - 12000 gold, 15 wood, and 25 ore.