Where to find those precious skill books?
| Type/Number | Location | Refresh |
|---|---|---|
| Green x5 Blue x3 | Supply Shop in base, you will need to refresh to have more chance to get some. It’s your best unlimited source! | Daily / Ether refresh |
| Blue x3 | Archedemon Infinite Corridor | 3 days |
| Green x1 Blue x1 | Weekly mission | Weekly |
| Green x5 Blue x2 | Regular Shop | Weekly |
| Green x5 Blue x3 Red x2 | Arena shop | Weekly |
| Blue x2 Red x1 | Star memory (very costy don’t do it) | Weekly |
| Blue x1 Red x1 | Limited shop (very costy) | Limited |
| Green x3, Blue x2, Red x1 | Guild Shop | Weekly |
| Red x1 | Level 9 trust unlocked | Per character |
| Green x3, Blue x2, Red x1 | Survey Hub 1 and 2 | Weekly |
| Green x15, Blue x4 | Skyward Tower | Monthly |
| Green Blue Red | All beginner quest/missions/story | 1 time only |
| Green Blue Red | Events quests / login | Depends on the event |