Help: Fortify Usage sling 'fortify' <target> Available Heretic level 1: Fortify. Fortify is the Heretic's basic defensive spell. It applies a strong AC improvement and adds damage reduction for a timed duration. Current Effects - Improves AC. - Adds damage reduction. - Scales with spellpower and magic support scaling. - Does not stack with itself; a protected target is refused. See Also: aura of fortification, dark blessing, heretic