The Obsidian Sword is superior because its Damage Amount % acts as a final multiplier for Amir’s Defense-scaled attacks. Since she ignores flat Attack stats, this highly obtainable weapon provides a pure, multiplicative power boost that high-rarity "stat sticks" simply cannot match.
The Contaminated Helmet provides both survivability and damage for Amir. Offensive and defensive capability matched with its frequent appearance (rare-rarity) making it the best choice in the Armor category.
The Amorphous Cube an amazing trinket as the Damage Amount it provides is small and additive in nature of calculations. Nonetheless it is still the only viable trinket in City of Mist. Swap this out for better trinket option from Monster (Invasion).
The Contaminated Helmet provides both survivability and damage for Amir. Offensive and defensive capability matched with its frequent appearance (rare-rarity) making it the best choice in the Armor category.
The Palasia’s Orb applies Weaken on the target when Amir’s Metal Pierce applies a Vulnerable stack. This synergies with Bone Cutter and activates its +30% Damage.
The Dagger That Tricked the Shadow is Amir’s 2nd source for Critical Damage (Executioner’s Tool). Critical Damage calculation step lies near the end of the formula, multiplying damage boost from other source, thus edging Dagger That Tricked the Shadow ahead of Obsidian Sword.
The +20% Damage Amount in the highlight for The Golden Rule. Amir does not have much Shield generating card except for her Basic Skill, Steel Barrier. Thus the +20 Shield gain here is negligible.