What are the seven obsidian nightfall

Nightfall obsidian is sevenSpecial dun armourThe basic concept of nightfall, also known as the six beasts, blue dragon, white tiger, rosefinch, xuanwu, Chen, Cheng snake.Nightfall can be made to match the five elements, tsing lung for wood, rosefinch for fire, white for the gold, black water, Chen and Cheng snakes for the soil.In addition can also apply the nightfall is combined with the hexagrams, air-dried.Seven telecom is also called seven zheng, is seven planets in the sky, is the sun, the moon, Venus, mercury, Mars, Jupiter, Saturn.Nightfall and seven obsidian are special dun armour to predict when the important basis.