Bullions for upgrading weapons and armors are as followed:
GrayCoa Bullion: Lvl 10 Weapons and Armors
Carbon Bullion: Lvl 20 Weapons and Armors
Red Jade Bullion: Lvl 30 Weapons and Armors
Blue Amethys Bulliont: Lvl 40 Weapons and Armors
Iron Bullion: Lvl 50 Weapons and Armors
Frost Bullion: Lvl 60 Weapons and Armors
Blue Kij Bullion: Lvl 70 Weapons and Armors
White Umkan Bullion: Lvl 80 Weapons and Armors
Silver Bullion: Lvl 90 Weapons and Armors
Millennial Ice Steal Bullion: Lvl 100+ Weapons and Armors