Fortification

Fortification represents a percentage chance to negate additional damage incurred from a critical hit or sneak attack.

• When a critical hit is negated, damage is applied normally rather than at the critical hit multiplier.
• Weapon enchantments that trigger on a critical hit (e.g. Holy Burst, Bloodletter or Radiance) continue to work even if the critical hit itself is negated.
• When a sneak attack is negated, the extra damage is not applied.

In DDO, most players strive for roughly +10% fortification per level, with the most durable characters achieving +300% at level 30. Most monsters don't have fortification, unless it is granted by the race/type (e.g. Undead, Constructs). Quest and raid bosses have higher fortification, but usually not full.

Players and monsters can gain abilities to bypass a portion of fortification.

Sources of Fortification

Items are the primary source of fortification for most player characters. Standard fortification items provide enhancement bonuses to fortification. Multiple effects do not stack with each other. You can combine them with rarer Insightful Fortification items (insight bonus). Item effects fully stack with the racial fortification, enhancements, or epic destiny perks.

Races and racial enhancements

• Bladeforged
• Warforged

Class abilities and enhancements

• Sacred Defender and Stalwart Defender
• Pale Master undead forms
• Elemental forms of Druids and Sorcerers
• Warlock (with GOO pact), also Soul Eater

Feats

• Epic past life - 10% per Fortification feat taken (Martial Sphere), up to 30%, when active
• Iconic Past Life Feats (5% per Bladeforged life, up to 15%)
• Improved Fortification (be aware of the side effect though)

Epic Destinies

• Brace for Impact (20/40%)
• Stand Against the Tide (5-25%)

Items

• Enhancement bonus - most common source
  • Named items
  • Random items with the Fortified prefix (20% - 125%)
  • Legacy items (before Update 19) with Light (25%), Moderate (75%), Heavy (100%) fortification, used to be a suffix on random armors, belts, shields, and rings
  • Augment: Sapphire of Light (25%)/Moderate (75%)/Heavy (100%) Fortification
• Insight bonus - stacks with enhancement bonus
  • Construct Fortification items
  • Exceptional Fortification items
• Other stacking bonuses
  • Fabricator's IngenuityFabricator's Ingenuity: +25% stacking fortification and +2 artifact bonus to your attack and damage rolls., set bonus on Fabricator's Gauntlets and Fabricator's Bracers

Penalty to fortification

Some effects reduce your fortification:

• Yugoloth Essence of Cunning potion
• Improved Sunder
• Various monster only special attacks, such as Bebilith's Rend Armor

Fortification on Monsters

• Any monster that belongs to a type or race that are considered "immune to critical hits" (Undead, Oozes, Constructs and Elementals) gains a natural Fortification of 100%. This also applies to summoned creatures and pets.
• Multiple Monster Champion types gain bonuses to Fortification depending on their Tier.
• Some monsters also gain buffs to Fortification on a quest-specific basis. Most quest and raid bosses have at least some fortification, with legendary raid bosses almost always having over 100%. Monsters can also gain fortification buffs from certain quest mechanics.

Bypassing Fortification

Since Update 13, monsters with sneak attack dice are able to bypass some of the player fortification equal to monsters' Challenge Rating. (DDO Forums ^{ARCHIVE ME!}) E.g.:

• If a CR 1 Kobold Sneak attacks someone with 50% fortification, the Kobold Sneak has a 51% chance to normally conduct a critical hit or sneak attack.
• If a CR 20 Lava Mephit attacks someone with 100% fortification, the Lava Mephit has a 20% chance to normally conduct a critical hit or sneak attack.
• If a CR 54 Sellsword Footpad attacks someone with 150% fortification, the Sellsword Footpad has a 4% chance to normally conduct a critical hit or sneak attack.
• If a CR 29 Earth Elemental attacks someone with 125% fortification, it is still going to have a 0% chance to critically hit or sneak attack, as it has no sneak attack dice.

Players can bypass a portion of enemy fortification (personal benefit), or generally reduce enemy fortification (universal benefit).

Sources of personal fortification bypass

Class Enhancements

• Items with Armor-Piercing enchantment
• Knight of the Chalice: Ascendancy t5 enhancement, (15%)
• Inquisitve: Improved Observation, (5% per stack, up to 25%)
• Deepwood Stalker: Advanced Sneak Attack (10%)
• Deepwood Stalker: Mark of the Hunted (10%)

Feats

• Cleric: Animal Domain level 9 Cleric feat (15%)
• Opportunist Rogue feat (10%)
• Precision feat, toggled stance (25%)
• Scion of Mechanus legendary feat (10%)

Epic Destinies

• Shadowdancer: Grim Precision (5/10/15%)
• Grandmaster of Flowers: Piercing Clarity (5/10%)
• Fury of the Wild: Sense Weakness (2/4/6%)
• Fury of the Wild: Primal Force (2/4/6%)

Enchantments/Items

• Silent Avenger set (10% heroic, 25% legendary, Artifact bonus)
• Sharn Melee and Ranged sets (5/15% heroic, 25% legendary, Artifact bonus)
• The Beast's Mantle three piece filigree set bonus (10%)
• Shattered Device: Armor Piercing filigree (5%)
• Through the Mists: Armor Piercing filigree (5%)
• Item:Solar Gem of Fortification Bypass (Heroic)/(Epic)/(Legendary) (10/20/30% Artifact bonus)
• Augment Set: Truthful Blow 3-piece set, (15%, Artifact bonus)

Other

• Trapsmith's Workshop guild buff (5%)

Sources of fortification reduction

Class Enhancements

• Assassin: Assassin's Trick (25%)
• Frenzied Berserker: Cracking Attack (up to 20%)
• Falconry: Expose Weakness (50%)
• Deepwood Stalker: Mark of the Hunted active use (25%)
• Kensai: Shattering Strike (15%)
• Angel of Vengeance: Shield of Condemnation (up to 50%)
• Shintao: Hand of Harm (dark monk) (25%)

Feats

• Sunder feat (25%)
  • Improved Sunder feat (25%), does not stack with Sunder

Enchantments/Items

• Destruction (enchantment) (up to 15%), for example via Deconstructor

Race/type specific reduction

• Deconstruct spell (25% vs constructs)
• Smiting Arrows (25% vs constructs)
• Weaken Construct items: (20% vs constructs)
• Weaken Undead items: (20% vs undead)
• Wrack Construct enhancement: (up to 50% to constructs) (Mechanic, Battle Engineer)

Bypassing immunity to sneak attack

In addition to fortification, monsters can possess "sneak attack immunity" that prevents sneak attacks (even at 100% fort bypass). Some special effects can remove that immunity: DDO Vault

• Assassin's Trick
• Wracking Shot
• Shadowdancer capstone

External links

• Fortification Reduction ^{ARCHIVE ME!}