Lowest to Highest
Negligent: 0.1x Strength
Disappointing: 0.25x Strength
Lesser: 0.5x Strength
Normal (No Prefix): 1x Strength
Better: 1.5x Strength
Major: 2x Strength
Master: 3x Strength
Peerless: 5x Strength
Example:
Steel Longsword of Flame (Normal 1x)
Adamantine Greatsword of Peerless Shielding (Peerless 5x)
Strength Affects Price by its 5x its x, except below Better.