When forging Equipment set,you can put Obsidian in as a material.It will increase the probability of forging legendary quality equipment sets. There are two types of Obsidian:Basic Obsidian and Advanced Obsidian.Basic Obsidian is used for equipment set under level 30.Advanced Obsidian is used for level 30 and above. Every forging costs one Obsidian.You can synthesis Obsidian to level it up. Two lower level Obsidian can synthesis a higher level one. Please note, you can only synthesize two Obsidian of the same quality; you can not acquire an Advanced Obsidian by synthesizing two Basic Obsidian. Different level of Obsidian has different probability of increasing equipment sets’ quality. Obsidian I：3% Obsidian II：5% Obsidian III：10% Obsidian IV：15% Obsidian V：20% Obsidian VI：25% Obsidian VII：35% Obsidian VIII：50% Obsidian IX：75% Obsidian X：100% Ways to get Obsidian: Ancient Dragon Tower trial. Hero Trial. Daily Task
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Game Guide for Clash of Kings