Implemented a lot of the damage and resistance types that were leftover from 0.10 so they actually come into play in-game.

0.12 Changelog

Building Changes

Blacksmith:
-Level 2 and higher Blacksmiths no longer grant bonus starting HP. They now grant +1 Physical Armor to all newly constructed and upgraded buildings.

General Changes
-Description information updated to provide resistance and attack information on all affected objects.

Armor Types:
-Phyiscal and Magical armor will be introduced to replace the old Armor system to reduce damage by percentage rather than a flat amount.
-Physical and Magical armor perform the final reduction for all appropriate damage types in the damage system.
-Physical damage types include Piercing, Slashing, and Crushing. Magical damage types include all others.
-Armor calculation for both Physical and Magical armor is done via the following formula: ((0.06 * armor) / (1 + 0.06 * armor))
-Armor will also increase damage by the same amount if it goes into negative values.
*Example: 1 Physical Armor reduces the final damage from Slashing/Crushing/Piercing damage by 5.7%. 5 Armor by 23.1%, 10 Armor by 37.5%
*Example: -1 Physical Armor increases the final damage from Slashing/Crushing/Piercing damage by 5.7%. 5 Armor by 23.1%, 10 Armor by 37.5%

Damage Types: Spells
-All spells that deal damage now have a damage type assosciated with them and deal variable damage rather than set damage.
-The damage type 'Magic' changed name to Arcane.

Acid Bolt
-Damage type set to Poison.
-Damage changed from 25 to 23 - 26.

Electric Fury
-Damage type set to Electric.
-Damage changed from 20 to 16 - 22.

Insect Swarm
-Damage type set to Piercing.
-Damage changed from 10 to 9 - 11.

Life Leach
-Damage type set to Necrotic.
-Damage changed from 15 to 13 - 15.

Exploding Aura
-Damage type set to Fire.
-Damage to primary target changed from 35 to 33 - 36.
-Damage to secondary targets changed from 15 to 14 - 16.

Inferno
-Damage type set to Fire.
-Damage changed from 40 to 38 - 42.

Radiant Energy
-Damage type set to Fire.
-Damage changed from 25 to 22 - 25.

Vortex
-Damage type set to Chaotic.
-Damage changed from 20 to 19 - 20.

Power Shock
-Damage type set to Electric.
-Damage changed from 20 to 18 - 21.

Drain Life
-Damage type set to Necrotic.
-Damage changed from 15 to 13 - 16.

Sun Scorch
-Damage type set to Fire.
-Damage changed from (15 + Level) to (14 + Level) - (16 + Level).

Energy Blast
-Damage type set to Arcane.
-Damage changed from 10 to 9 - 10.

Consume Life
-Damage type set to Necrotic.
-Damage changed from 6 to 5 - 7.

Henchmen Changes
-Most Henchmen now deal a damage type with a minimum and a maximum damage and have Resistances.
-Peasants, Tax Collectors, and Caravans have 0% Resistance.

City Guard
-Damage type set to Slashing.
-Damage changed from 1 - 12 to 5 - 6.
-Resistances: 5% Piercing
-3 Physical Armor

Veteran City Guard
-Damage type set to Slashing.
-Damage changed from 1 - 13 to 5 - 7.
-Resistances: 5% Slashing, 10% Piercing
-4 Physical Armor

Court Mage
-Resistances: 15% Poison, 30% Arcane, 15% Necrotic
-3 Magical Armor

Mercenary Arbalest
-Damage type set to Piercing
-Damage changed from 1 - 22 to 8 - 12.
-Resistances: None
-1 Physical Armor

Palace Guard
-Damage type set to Slashing.
-Damage changed from 1 - 13 to 5 - 7.
-Resistances: 5% Slashing, 10% Piercing
-5 Physical Armor

Royal Archer
-Damage type set to Piercing
-Damage changed from 1 - 13 to 5 - 7.
-Resistances: None
-2 Physical Armor

Squire
-Damage type set to Slashing.
-Damage changed from 1 - 16 to 7 - 8.
-Resistances: 15% Slashing, 20% Piercing
-8 Physical Armor

Hero Changes
-Vitality now grants +1 HP to heroes per point on top of their HP bonus per level.
-All Heroes now have their base HP start at 2.
-Maximum mana now increases each level by 1 per 6 points of Intelligence.
-Newly trained heroes now start with Maximum Mana.

Monster Changes
-Most non-expansion monsters now deal a damage type with a minimum and a maximum damage.

Non-Expansion Monsters
Daemonwood
-Damage type set to Crushing.
-Damage changed from 1 - 29 to 12 - 15.
-Resistances: -25% Fire, 20% Chaotic, 30% Crushing, 20% Slashing, 30% Piercing
-4 Physical Armor

Dragon
-Resistances: 90% Fire, 60% Arcane, 30% Crushing, 25% Slashing, 25% Piercing
-6 Physical Armor
-4 Magical Armor

Dryad
-Damage type set to Crushing.
-Damage changed from 1 - 11 to 4 - 6.
-Resistances: 10% Poison, 25% Arcane, -20% Necrotic
-2 Magical Armor

Evil Oculus
-Resistances: 20% Fire, 40% Electric, 50% Arcane
-2 Physical Armor
-6 Magical Armor

Flowering Strangleweed
-Damage type set to Poison.
-Damage changed from 1 - 10 to 4 - 5.
-Resistances: -10% Fire, -33% Cold, 65% Poison, -33% Slashing

Giant Rat
-Damage type set to Piercing & Poison.
-Damage changed from 1 - 7 to 1 - 2 Piercing Damage and 1 - 1 Poison Damage.
-Resistances: 20% Poison

Giant Spider
-Damage type set to Piercing & Poison.
-Damage changed from 1 - 16 to 1 - 3 Piercing Damage and 3 - 4 Poison Damage.
-Resistances: 50% Poison, -30% Crushing, -20% Piercing

Goblin Archer
-Damage type set to Piercing.
-Damage changed from 1 - 7 to 3 - 4.
-Resistances: None

Goblin Champion
-Damage type set to Slashing & Crushing.
-Damage changed from 1 - 9 to 2 - 3 Crushing Damage and 1 - 4 Slashing Damage.
-Resistances: 10% Crushing, 15% Slashing, 15% Piercing
-2 Physical Armor

Goblin Fighter
-Damage type set to Slashing.
-Damage changed from 1 - 7 to 3 - 4.
-Resistances: None
-1 Physical Armor

Goblin Priest
-Damage type set to Crushing.
-Damage changed from 1 - 5 to 2 - 3.
-Resistances: None
-1 Magical Armor

Harpy
-Damage type set to Piercing.
-Damage changed from 1 - 18 to 6 - 9.
-Resistances: 10% Cold, 5% Electric
-1 Physical Armor

Hellbear
-Damage type set to Crushing.
-Damage changed from 1 - 16 to 7 - 8.
-Resistances: 30% Cold, 10% Crushing, 20% Slashing
-2 Physical Armor

Medusa
-Damage type set to Piercing & Poison.
-Damage changed from 1 - 13 to 3 - 5 Piercing Damage and 1 - 2 Poison Damage.
-Resistances: 25% Poison, 35% Arcane
-1 Physical Armor

Minotaur
-Damage type set to Slashing.
-Damage changed from 1 - 19 to 7 - 10.
-Resistances: 15% Cold, 20% Crushing, 15% Slashing
-2 Physical Armor

Ratman
-Damage type set to Slashing.
-Damage changed from 1 - 11 to 4 - 5.
-Resistances: 25% Poison, 5% Crushing, 5% Slashing
-1 Physical Armor

Roc
-Damage type set to Piercing.
-Damage changed from 1 - 7 to 2 - 4.
-Resistances: 5% Cold, 10% Electric

Rock Golem
-Damage type set to Crushing.
-Damage changed from 1 - 55 to 24 - 27.
-Resistances: 33% Fire, 25% Electric, 10% Crushing, 30% Slashing, 55% Piercing
-10 Physical Armor

Rust Spitter
-Damage type set to Necrotic.
-Damage changed from 1 - 9 to 3 - 5.
-Resistances: 30% Poison, 10% Arcane

Skeleton
-Damage type set to Crushing.
-Damage changed from 1 - 13 to 6 - 7.
-Resistances: 35% Poison, -50% Divine, 40% Necrotic, 75% Piercing

Troll
-Damage type set to Crushing.
-Damage changed from 1 - 21 to 9 - 11.
-Resistances: -10% Fire, -30% Cold, 45% Poison, 40% Chaotic, 20% Crushing, 20% Slashing, 20% Piercing
-3 Physical Armor

Varg
-Damage type set to Slashing.
-Damage changed from 1 - 15 to 6 - 8.
-Resistances: 30% Cold, 5% Slashing

Vampire
-Resistances: -50% Fire, 35% Cold, -25% Divine, 40% Necrotic
-1 Physical Armor
-3 Magical Armor

Werewolf
-Damage type set to Slashing.
-Damage changed from 1 - 17 to 7 - 9.
-Resistances: 15% Cold, 25% Crushing, 20% Slashing
-1 Physical Armor
-1 Magical Armor

Zombie
-Damage type set to Crushing.
-Damage changed from 1 - 13 to 5 - 7.
-Resistances: -50% Divine, 30% Necrotic
-1 Physical Armor

Majestic Majesty Monsters

Blood Mage
-Resistances: 15% Arcane, -30% Divine, 50% Necrotic
-5 Magical Armor

Crimson Archer
-Damage type set to Piercing & Necrotic
-Damage changed from 1 - 16 to 7 - 8 Piercing damage and 1 - 1 Necrotic damage.
-Resistances: -30% Divine, 20% Necrotic
-3 Physical Armor

Elder Orbs
-Resistances: 30% Fire, 45% Electric, 66% Arcane, 15% Chaotic
-9 Magical Armor

Gore Guard
-Damage type set to Slashing & Necrotic
-Damage changed from 1 - 15 to 6 - 8 Slashing damage and 1 - 1 Necrotic damage.
-Resistances: -30% Divine, 20% Necrotic, 10% Slashing, 20% Piercing
-4 Physical Armor

Maniacal Arbalest
-Damage type set to Piercing & Necrotic
-Damage changed from 1 - 25 to 11 - 14 Piercing damage and 1 - 1 Necrotic damage.
-Resistances: -30% Divine, 20% Necrotic
-2 Physical Armor

Minotaur Lord
-Damage type set to Slashing.
-Damage changed from 1 - 30 to 12 - 16.
-Resistances: 10% Fire, 25% Cold, 30% Crushing, 25% Slashing, 10% Piercing
-7 Physical Armor

Sanguine Peasant
-Resistances: -30% Divine, 20% Necrotic

Scarlet Squire
-Damage type set to Slashing & Necrotic
-Damage changed from 1 - 18 to 8 - 9 Slashing damage and 1 - 1 Necrotic damage.
-Resistances: -30% Divine, 20% Necrotic, 5% Crushing, 25% Slashing, 40% Piercing
-9 Physical Armor

Spirit Troll
-Damage type set to Crushing.
-Damage changed from 1 - 16 to 7 - 8.
-Resistances: 50% Poison, -66% Arcane, 75% Chaotic, 50% Crushing, 50% Slashing, 50% Piercing
-2 Physical Armor
-1 Magical Armor

I've included a screenshot to reflect how the changes look in-game here.