These are Uber weapons for those who are lower than level 120. Here are the places where you can get those weapons from -

Earth - Blade Of Awe (Very Basic)
When you Become Guardian

Darkness - Shadowspear
Level: 85
Price: 400,000
Sell back: 360,000
Location: Alnaphar - Quest for the Shadow Set

Light - Golden Axe
Level: 85
Price: 400,000
Sell back: 360,000
Location: Alnaphar Rainbow

Fire - ReignBringer
Level: 85
Price: 400,000
Sellback: 360,000
Location: Alnaphar: Reign Shop Quest, final

Ice - Superior Gradient Sphere Staff
Level: 102
Price: 175,000
Sellback: 87,500
Location: Fading Warlic!

Energy - Mjollnir
Level: 105
Price: 700,000
Sellback: 630,000
Location: Thunder Mountain

Wind - Tonbo Giri
Level: 105
Price: 700,000
Sellback: 630,000
Location: Bridge to the Sky

Water - Poise
Level: 80
Price: 550,000
Sellback: 412,500
Location: Warlic's Advanced Magic