Crystallographer

You gain the following benefits.

Jeweled Alchemy. You gain proficiency with Jeweler's Tools and learn the Formula for Frigid Azote, or another Alchemical Item if you already know it.

Paralyzer. Whenever a creature makes an ability check or saving throw to end an effect caused by one of your Alchemical Items that reduced its speed, the creature must roll 1d4 and subtract the number rolled from the d20 roll.

When you create an item that reduces Speed or that creates an object or structure (such as an Instant Wall), you can infuse the item with at least 5 GP of any of the following materials to enhance it.

Banded Agate. The form of any structure created by using the item expands by 5 feet in one direction of your choice, provided the space it would enter is unoccupied.

Carbon. Any object or structure created by using the item is hardened, giving it an AC equal to your Alchemy save DC and additional Hit Points equal to your Alchemist level.

Cicada. For 1 minute, the target must make a Constitution saving throw at the start of each of its turns. On a failure, the creature must spend 2 feet of speed for every 1 foot it attempts to use a Walk or Climb speed. On a success, this effect ends.

Obsidian. Each time the creature makes an ability check or saving throw against the Alchemical item or comes into contact for the first time on its turn with an object or structure created by the item, it takes 1d6 Piercing damage.

You can use your Eureka feature to create a nonmagical crystal or gem of your choice. You can create this item using valuables (such as gold pieces) of a value equal to half the value of the item. The value of the item can't be more than 50 times your alchemist level, and disappears after a number of hours equal to your proficiency bonus.

Your Vitreous Theory is enhanced.

Banded Agate. The form expands by 10 feet instead.

Carbon. Any object or structure created is Immune to Bludgeoning, Piercing, and Slashing damage other than from magic or Adamantine weapons.

Cicada. The item also affects a creature's Fly and Swim speeds.

Obsidian. The Piercing damage increases to 2d6.

Any item you create with Sterner Stuff no longer disappears, and you can use Eureka to Craft a Spark of Creation and only need to provide 500 GP to do so.