Violet Trial is a daily Special Quest that is available on Mondays and Thursdays. The Very Hard difficulty only appears on Thursdays. Higher difficulties have an increased chance of dropping more and/or better loot.
Violet Trial - Very Hard is currently the most AP-efficient quest to farm 
Rainbow Prism.
 |
 |
|
| 8 AP ?? RP ?? EXP |
15 AP ?? RP ?? EXP |
25 AP ?? RP ?? EXP |
Drops[]
| Wooden Chest | |
|---|---|
|
Prism Chip |
| Silver Chest | |
|
Flawed Prism |
|
Flawless Prism |
| Gold Chest | |
|
Rainbow Prism |