Circle of the elements

You create a massive circle of the elements air water fire or lightning  which you can choose between to be your damage type with a flick of your wrist you can hit some one with freezing water which reduces their speed to 5ft until your next turn and deals 4d8 of cold damage or you could hit them with air and blast them back 10ft from you and deals 1d8 of force damage or you could strike them with fire dealing 3d8 of fire damage and on their turn deals a extra 1d4 of fire damage or you could hit them with a bolt of lightning dealing 2d8 of lightning damage and and you have the advantage if the target is wearing armor made of metal

note you have to stay within the 10ft by 10ft circle to use the magic and you can change damage type whenever you wish