From DDO wiki
Fortification represents a percentage chance to negate a critical hit or sneak attack. When a critical hit is negated, damage is applied normally rather than at the critical hit multiplier.
[edit] Light Fortification
Effect: Yields a 25% protection against critical hits and sneak attacks.
Base price modifier: +1
Found on: Belts and Rings
Suffix
[edit] Moderate Fortification
Effect: Yields a 75% protection against critical hits and sneak attacks.
Base price modifier: +3
Found on: Belts and Rings
Suffix
[edit] Heavy Fortification
Effect: Yields a 100% protection against critical hits and sneak attacks.
Base price modifier: +5
Found on: Belts and Rings
Suffix
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