Some further details on what needs to be done can be found on Path of Exile Wiki:To-do list/Automatic upgraded from and issues can be posted on the talk page. Frozen Trail is a unique Cobalt Jewel.
(7-10)% increased Projectile Damage
With at least 40 Intelligence in Radius, Frostbolt Projectiles gain 40% increased Projectile Speed per second
With at least 40 Intelligence in Radius, Frostbolt fires 2 additional Projectiles
The Maraketh knew that a mountain pathfree of vegetation was cut by regular avalanches,and so the advancing Eternals were unwittingly drawn into a deathtrap.
A simple tool to price check your items in path of exile by "copy and paste". It is that simple!
Price in Leagues