Grindstone of Life

Tradable

Grindstone of Life
Description	A grindstone containing the intense power of life. Use to consume the grindstone and Mesos to polish set Level 4 Special Skill Rings that are untradable for a chance to upgrade them to Level 5. The polish success rate and Mesos consumed are based on how many grindstones are used.
Effects	Enhances an untradable Level 4 Special Skill Ring to Level 5, with the success rate and Meso cost dependent on the number of Grindstones of Life used. The following Special Skill Rings are eligible: Ring of Restraint Level 4 Continuous Ring Level 4 Weapon Jump S Ring Level 4 Weapon Jump I Ring Level 4 Weapon Jump L Ring Level 4 Weapon Jump D Ring Level 4 Risk Taker Ring Level 4 Totalling Ring Level 4 Critical Damage Ring Level 4
Max per slot	100
Dropped by	Interactive / Non-Reboot Worlds only: Guardian Kalos Treasure Chest [Normal Mode] World Heart [Normal Mode] Peace Blooms Again [Normal Mode] Guardian Kalos Treasure Chest [Chaos Mode] World Heart [Hard Mode] Guardian Kalos Treasure Chest [Extreme Mode] World Heart [Extreme Mode]
Rewarded from	Life Boss Ring Box (Rewards Grindstone of Life x 1 at a 14.51613% chance; Interactive / Non-Reboot Worlds only)
Tradability	Interactive / Non-Reboot Worlds: Tradable Heroic / Reboot Worlds: Tradable within the same world
Sold for	Cannot be sold
Notes	None

Untradable

Grindstone of Life
Description	A grindstone containing the intense power of life. Use to consume the grindstone and Mesos to polish set Level 4 Special Skill Rings that are untradable for a chance to upgrade them to Level 5. The polish success rate and Mesos consumed are based on how many grindstones are used.
Effects	Enhances an untradable Level 4 Special Skill Ring to Level 5, with the success rate and Meso cost dependent on the number of Grindstones of Life used. The following Special Skill Rings are eligible: Ring of Restraint Level 4 Continuous Ring Level 4 Weapon Jump S Ring Level 4 Weapon Jump I Ring Level 4 Weapon Jump L Ring Level 4 Weapon Jump D Ring Level 4 Risk Taker Ring Level 4 Totalling Ring Level 4 Critical Damage Ring Level 4
Max per slot	100
Dropped by	Heroic / Reboot Worlds only: Guardian Kalos Treasure Chest [Normal Mode] World Heart [Normal Mode] Peace Blooms Again [Normal Mode] Guardian Kalos Treasure Chest [Chaos Mode] World Heart [Hard Mode] Guardian Kalos Treasure Chest [Extreme Mode] World Heart [Extreme Mode]
Rewarded from	Life Boss Ring Box (Rewards Grindstone of Life x 1 at a 14.51613% chance; Heroic / Reboot Worlds only)
Tradability	Untradable
Sold for	Cannot be sold
Notes	None

Success Rate Table

Number of Stones	Success Rate	Cost
1	10%	500,000,000 Mesos
2	20%	1,000,000,000 Mesos
3	30%	2,000,000,000 Mesos
4	40%	3,500,000,000 Mesos
5	50%	5,000,000,000 Mesos