Materials and rewards

Blessing Scroll

Eliminates the risk of an item being destroyed when an improvement fails. In the case of failure, the item's quality is merely reduced by 1 instead.

Sources

Event Chests Moonlight Treasure Chest

Event Chests Mysterious Sapphire Box

Event Chests Bronze King's Loot

Other Chests Text Stone Chest (Lv. 1-20)

Other Chests Text Stone Chest (Lv. 25-35)

Other Chests Text Stone Chest (Lv. 40-65)

Other Chests Text Stone Chest (Lv. 70-80)

Other Chests Text Stone Chest (Lv. 85-90)

Dungeon Chests Spider Baroness Chest

Event Chests Bronze Okey Box