So this has been an off and on subclass that I've been working on. I'm curious what you guys think about that I have so far in regards to it. It's been awhile since I've gotten feedback on it, so anything helps.

Contractor 

A Contractor is an artificer who specializes in the creation and destruction of structures. While most artificers focus on crazy inventions and magical contraptions, a Contractor can manipulate their surroundings aided by their Arcanum Blocks. With these blocks, a Contractor can create temporary structures, move various objects and even use them as a weapon. The amount of versatility that a contractor brings to any group makes them a vital asset anywhere they choose to put their efforts.

Tools of the Trade

3rd-level Contractor feature

You gain proficiency with Battleaxes, Greataxes, Mauls, and Warhammers. You also gain proficiency in either Carpenter's Tools or Mason's Tools. If you already have proficient in either tool, you gain proficiency with one other type of artisan’s tools of your choice.

Contractor Spells

3rd-level Contractor feature

You learn the Mold Earth cantrip, it counts as artificer cantrip for you and doesn’t count against the number of artificer cantrips you know.

You also always have certain spells prepared after you reach particular levels in this class, as shown in the Contractor Spells table. These spells count as artificer spells for you, but they don’t count against the number of artificer spells you prepare.

Contactor Spells

Arcanum Blocks

3rd-level Contractor feature

You can create magical blocks that you can manipulate. Using your carpenter's tools or mason's tools, as an action you create three Arcanum Blocks that are no larger than 1 foot on each side. Each block counts as a tiny object that floats around you for the duration. When you create the blocks, you determine what material that they are made of, such as stone, wood or another building material; your choice has no effect on its game statistics. When you reach higher levels in this class you can create an additional Arcanum Block, increasing to 4 blocks at 5th level, 5 blocks at 9th level, and 6 blocks at 15th level.

Once you create the blocks, you can’t do so again until you finish a long rest or until you expend a spell slot to create more. If you create additional Arcanum Blocks while blocks are still present, the previously created Arcanum Blocks are destroyed.

The Arcanum Blocks are magical objects. Regardless of size, the each block has an AC equal to 10 + your proficiency bonus and has a number of hit points equal to three times your artificer level. The blocks have resistance against Bludgeoning, Piercing, and Slashing from Nonmagical Attacks that aren't Adamantine. The blocks are also are immune to poison damage, psychic damage, and all conditions. If the mending spell is cast on a block, it regains 2d6 hit points. Each block disappears after 1 hour, if its hit points are reduced to 0, or if you dismiss the blocks early as an action.

As a bonus action, choose one block within 60 feet of you up to move up to 30 feet and you can issue one command (see below). You can also use your action to choose up to three blocks within 60 feet of you and have each chosen block move up to 30 feet.

• Slam. The block is hurled into a creature or object within 5 feet of it. Make a melee spell attack, originating from the block, against the target using your spell attack modifier. On a hit, the target takes 1d6 + your proficiency bonus bludgeoning damage.
• Push. The block tries to push a creature within 5 feet of it. The chosen creature must make a Strength saving throw against your spell save DC or be pushed up to 5 feet horizontally in a direction of your choice, which it can choose to fail. A Large or larger creature has advantage on this saving throw. The block moves with the target to remain within 5 feet of it.
• Carry. The block picks up and carries an object within 5 feet of it. This object cannot be worn or carried by another creature, and must weigh less than 15 times your artificer level. After which, the block can use any remaining movement as part of this command. On subsequent turns, the block can move but cannot perform another command until the blocks drops the object, which can be done as a free action.
• Build. The block changes its size and shape to form a simple structure such as a box, wall, or pillar; provided that the block is in an unoccupied space and the new form is no larger than 5-feet on each side. After which, the block cannot move or follow additional commands, with the exception of the build command. If you give the build command, you choose to either have the block return to it's original form, or have the block change into a different simple structure. If a creature other than you tries to move the block, it must use its action to make a Strength check against your Spellcasting DC to move the block up to 10 feet on a success.

When an Arcanum Block is commanded to do an action, it can change its shape and size to accommodate for the command. Such as taking the form of a maul for the Smash command or into a disk for the Carry command. Changes in this manner have no effect on how the Arcanum Blocks function.

Wrecker's Impact

5th-level Contractor feature

You now wield your weapons with destructive force. Once on each of your turns, when you hit a target with a weapon that deals bludgeoning or slashing damage, you can deal additional force damage equal to 1d6 + half your artificer level.

In addition, the Arcanum Blocks and weapons that deal bludgeoning or slashing damage gain the Siege property (deals double damage to objects and structures). The Arcanum Block's attacks also count as magical for the purpose of overcoming resistance and immunity to nonmagical attacks and damage.

Precautionary Measures

9th-level Contractor feature

Taking it upon yourself to protect those imminent danger, you can use your Arcanum Blocks to protect those in need. When a creature that you can see (including yourself) is hit by an attack, you can use your reaction to have a block within 30 feet of the creature to move to their space and take the resulting damage instead. If the block is reduced to 0 hit points, it is destroyed and creature takes any remaining points of damage.

You can use this feature a number of times equal to your Intelligence modifier (minimum of once) and you regain all expended uses at the end of a long rest.

Master Builder

15th-level Contractor feature

Through hands-on experience and rigorous training the Arcanum Blocks are further improved, granting you the following benefits;

• When you use your action to move up to three Arcanum Blocks, you can now issue one command to each of the chosen blocks. Alternatively, as an action, you can move each block within 60 feet of you up to 30 feet.
• The Slam command now deals bludgeoning damage equal to 1d8 + your proficiency bonus.
• The Push command can now push a creature up to 10 feet horizontally.
• At the start of each of your turns, if an Arcanum Block within 60 feet of you used the Build command to turn into a different shape, it can return to it's original form as a free action.