School of Compression

A mage who manipulates shards of magical glass, altering the nature of their spells so they cut through the air like razors. Instead of fireballs or lightning, their spells shred enemies with slashing damage.

Flavour Notes: Spells etched into sheets of thin glass, Spellcasting focus is a shard of glass/mirror shard.

Compression Savant

Beginning when you select this school at 2nd Level, if you were not previously, you gain proficiency with glassblower's tools. In addition, you can instantly copy down 1 spell into your spellbook once per long rest. 

Fractured Casting

Starting at 2nd level when you choose this school, Your ability to manipulate glass improve significantly. When you cast a spell that deals damage, you can change its damage type to slashing. The spell becomes visually and thematically made of razor-sharp glass shards. You can use this feature a number of times equal to your Intelligence modifier (min 1) per long rest.

Glass Wall

Starting at 2nd level when you choose this school, You are able to summon a wall of glass up to 10ft in front of you as a reaction. You may do this a number of times equal to your Intelligence modifier (min 1) per long rest. The wall can withstand up to 25 multiplied by your intelligence modifier before shattering. 

Shard Armory

Starting at 6th level, when you cast a spell of 1st level or higher, you can cause an amount equal to your intelligence modifier of thin shards of magical glass to orbit you. Every time you take an instance of damage, you lose a shard until none remain. While at least one shard remains, you can use your reaction to reduce slashing, piercing, or force damage by 1d6 + your Intelligence modifier, and return it to the enemy as slashing damage. 

Razor Weave

Starting at 10th Level, when you cast a spell using fractured casting, you can cause up to 3 creatures of your choice (that you hit) to take 1d8 slashing damage at the beginning of every turn until they expend an action to cover the wound if they have anything to cover it with or if there is anything nearby to cover it with. 

Glass Tempest

Starting at 14th level, Once per long rest, when you cast a spell that targets multiple creatures, you can create a storm of mirrored shards. All creatures affected must make a Dexterity saving throw. On a fail, they can chose either to be blinded until the end of their next turn or take additional 1d12 slashing damage on a failed save.