Materials and rewards

Soul Stone

The legendary stone used to increase your grand master skills. It disappears after use.

Sources

Event Chests Moonlight Treasure Chest↗ Event Chests Mysterious Sapphire Box↗ Event Chests Golden King's Loot↗ Other Chests Text Stone Chest (Lv. 70-80)↗ Other Chests Text Stone Chest (Lv. 85-90)↗ Other Chests Training Chest (Lv. 2)↗ Boss Chests Orc Chieftain Chest↗ Boss Chests Dark Leader Chest↗ Boss Chests Queen Spider Chest↗ Boss Chests Nine-Tailed Fox Chest↗ Boss Chests Flame King Chest↗ Boss Chests Yellow Tiger Beast Chest↗ Dungeon Chests Beran-Setaou Chest↗ Event Chests Golden Okey Box↗