A white misty beam fires from your fingers, freezing everything in its path until it hits a target. Once the beam connects with a target, they must make a Constitution saving throw, on a successful save the target takes 5d8 + 20 cold damage. On a failed save, the target's speed is reduced to 0 and is incapacitated as they are incase in a block of ice for one minute until they are broken out. At the start of their turn, the target may make this check again with disadvantage to attempt to break out. Outside forces may attempt break the ice block with the use of an attack action, where they must beat an AC of 10 +  the spell's level. Once broken out, the creature's speed is reduced to half and will suffer vulnerability to fire damage until the minute ends. 

Restriction: Creatures immune to cold damage are not incapacitated from being incased. (I.E. they may make the Constitution save and use their action to attempt to break out)