Wall of Glass

You weave together threads of conjuration magic to create 4 sheets of translucent glass that lasts for the duration. The sheets of glass are 5-foot wide and 10 feet tall, a sheet of glass must be placed contiguous to another sheet. A sheet of glass has a AC of 5 and 1 hit point. When a sheet of glass is destroyed any creature within 5 feet of it suffer 1d6 points of piercing damage on a failed Dexterity saving throw or half as much on a successful one as a downfall of glass shards rain over them. When a sheet of glass is destroyed the space it occupied becomes covered in glass shards and any creature that enters that space will suffer 1d4 piercing damage. A creature affected by this has its walking speed reduced by 10 feet until it regains at least 1 hit point or until the spell ends. A creature moving through the space at half speed takes no damage.

When you cast this spell using a spell slot of 2nd level or higher you can create an additional sheet of glass per spell slot above the 1st.