101Leafy researched the games.
The GMR Chrome Heart

A mighty monster-masher. Molded in metal by the Gods of Rock for GMR
| Class | Dual Swords |
|---|---|
| Rarity | 5 |
| Attack | 238 |
| Price | 998z |
| Crafting cost | 499z |
Sharpness
The gauge holds 250 points and starts full. It has four levels, and the level falls as the gauge runs down; sharpening fills it again. The bar is drawn against 300, the most any weapon holds.
| Level | Gauge | Attack |
|---|---|---|
| 4 | 221 to 250 | x1.125 |
| 3 | 111 to 220 | x1 |
| 2 | 81 to 110 | x0.75 |
| 1 | 0 to 80 | x0.5 |
Crafting
| Material | Count |
|---|---|
| Chrome Voucher | 5 |
| Machalite Ore | 5 |
| Iron Ore | 35 |
| Unknown Skull | 1 |