Copper Inferno

You conjure ten spikes of molten copper. The spikes are diagonally conjured upwards out of the ground around the caster, with resemblance to a wreath, then solidifying and surrounding the caster. 

Each creature in a 5-foot sphere originating from you must make a Dexterity saving throw. On a failed save, a creature takes 2d6 piercing damage and is restrained by the copper spikes. On a successful save, the creature takes half as much damage and isn't restrained.

A creature restrained by the webs can use its actions to make a Strength check against your spell save DC. If it succeeds, it is no longer restrained.

In addition, the conjured spikes reach up to 5 ft and the area surrounding the caster is now considered difficult terrain.

Also the spikes have an AC of 10 and have 5 HP before being destroyed. The spikes vanish after one minute.