This brain stem is a precious but hard to craft Gravios part.
| Hub G3 // Hunt-a-Thon: Gravios | Hunt 2 | x1 | 40% |
| Hub G3 // Hunt-a-Thon: Gravios | Reward2 | x1 | 6% |
| Hub G3 // A Certain Gravitas | Reward2 | x1 | 6% |
| Hub G4 // Marshland Fandango | Reward1 | x2 | 6% |
| Hub G4 // Death at My Greaves | Reward1 | x2 | 6% |
| Village 9★ // Ore d'Oeuvres | Reward1 | x1 | 5% |
| Village 9★ // Ore d'Oeuvres | Sub | x1 | 5% |
| Village 9★ // Wish upon a...Gravios? | Reward1 | x1 | 5% |
| Village 9★ // Trouble Comes in Threes | Reward1 | x1 | 5% |
| Village 10★ // Bring Me My Sword | Reward1 | x1 | 5% |
| Village 10★ // Bring Me My Sword | Reward2 | x1 | 5% |
| Hub 6★ // A Cure for Cowardice | Reward1 | x1 | 5% |
| Hub 6★ // A Cure for Cowardice | Sub | x1 | 5% |
| Hub G3 // Hunt-a-Thon: Gravios | Reward1 | x1 | 5% |
| Hub G3 // A Certain Gravitas | Sub | x1 | 5% |
| Hub G3 // A Certain Gravitas | Reward1 | x1 | 5% |
| Hub G4 // A Very Long Engravement | Reward2 | x1 | 5% |
| Special Permit // Drilltusk G3: Hunt | Sub | x1 | 5% |
| Hub DLC // A Solid Argument | Reward2 | x1 | 5% |
| Hub G4 // Gravios Backbreaker | Reward1 | x1 | 3% |
| Hub DLC // Capcom: Prowler's Spirit | Reward1 | x1 | 3% |
| A Cure for Cowardice | Reward2 | x1 | 5% |
| A Certain Gravitas | Reward1 | x1 | 5% |
| A Certain Gravitas | Reward2 | x1 | 5% |
| Insect Glaive | Gravordius LV2 | x1 |
| Heavy Bowgun | Gravios Gigahowl LV3 | x1 |
| Light Bowgun | Titan Panzer LV3 | x1 |
| Gunlance | White Cannon LV2 | x1 |
| Insect Glaive | Gravordius LV2 | x2 |
| Heavy Bowgun | Gravios Gigahowl LV3 | x1 |
| Heavy Bowgun | Invaluable Lost Cannon LV3 | x1 |
| Light Bowgun | Titan Panzer LV3 | x1 |
| Hammer | Graviton Hammer LV3 | x2 |
| Gunlance | White Cannon LV2 | x2 |