Mechanist

Mechanists feel that the greatest skill of an Artificer is to mold and shape metal into artificial life. These constructs can serve a variety of functions, both in and out of combat. 

Tool Proficiency

When you adopt this specialization at 3rd level, you gain proficiency with smith’s tools. If you already have this proficiency, you gain proficiency with one other type of artisan’s tools of your choice.

Metalcraft

By third level, your tinkering and crafting has born the fruit of small mechanical constructs. They are friendly to you and your companions and obey your commands. When gaining this feature, you start with one construct. You may spend time during long rests to build a new construct. The total number of constructs you can have crafted with this feature is equal to your proficiency modifier. The constructs can collapse down to be one size category smaller for easier transport. Activating them requires an action after which they may act immediately. 

In combat, a construct shares your initiative count, but it takes its turn immediately after yours. It can move and use its reaction on its own, or follow orders you give it. Directing your construct uses a bonus action, or you may spend your standard action to direct all your active constructs.
If the Mending spell is cast on a construct, it regains 2d6 hit points. If it has died within the last hour, you can use your tinker’s tools as an action to revive it, provided you are within 5 feet of it and you expend a spell slot of 1st level or higher. The construct returns to life after 1 minute with all its hit points restored.
When you Fabricate a construct, select one type, chosen from the options below.

Observation Drone
Tiny construct, unaligned
Armor Class: 18 
Hit Points: 6 (1d6 + 3) + 2 times your Artificer level
Speed: Fly 30 ft. 
STR       DEX       CON      INT     WIS     CHA
2 (-5) 18 (+4) 12 (+1) 3 (–4) 16 (+3) 7 (–2)
Damage Immunities: poison
Condition Immunities: charmed, poisoned
Senses: Darkvision 60ft, passive Perception 13
Languages — (understands whatever languages you speak)
Actions
Claw. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 1d4+4 
slashing damage.

Sensory Link. You can connect your senses to the construct's as an action. you can see through the construct’s eyes and hear what it hears until you dismiss this effect as a bonus action, gaining the benefits of any Special Senses that the construct has. During this time, you are deaf and blind with regard to your own Senses.

 

Combat Automaton
Medium construct, unaligned
Armor Class 15 
Hit Points 15 (3d6 + 3) + 5 times your Artificer level
Speed 30 ft.
STR       DEX       CON      INT     WIS       CHA
14 (+2) 14 (+2) 14 (+2) 3 (–4) 10 (+0) 7 (–2)
Damage Immunities: poison
Condition Immunities: charmed, poisoned
Senses: passive Perception 10
Languages — (understands whatever languages you speak)
Actions
Claw. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 2d6+2 
slashing damage.

Installed Weapon. Choose 1 melee or ranged Martial weapon. This construct is treated has having that weapon installed into its body. It cannot be disarmed or drop the weapon, but it can retract it to an inactive state. 

Servitor Construct
Small construct, unaligned
Armor Class 12 
Hit Points 15 (2d6 + 3) + 3 times your Artificer level
Speed 30 ft.
STR       DEX       CON      INT     WIS       CHA
10 (+0) 14 (+2) 10 (+0) 3 (–4) 12 (+1) 7 (–2)
Damage Immunities: poison
Condition Immunities: charmed, poisoned
Senses: passive Perception 11
Languages — (understands whatever languages you speak)
Actions
Claw. Melee Weapon Attack: +1 to hit, reach 5 ft., one target. Hit: 1d6+2 
slashing damage.

Tools. Select 3 Tools. The construct can make checks using those tools and is considered having and being proficient with the selected tools. It uses your Proficiency bonus for any checks.

Galvanized Constructs

At 5th level, you have figured how to craft better constructs. Any Construct you create gains an additional Bonus to it's Armor Class and any ability rolls they do. This bonus is equal to your Intelligence bonus.

Empowered Matrix

At 9th level, you have found a way to weave more magic into your constructs to make them even more deadly. All attacks that your constructs make are considered magical and deal an extra 2d6 of Force damage. 

Master Engineer

Starting at 15th level, you've reached the pinnacle of your crafting abilities. The number of constructs you can have crafted with Metalcraft increases by your Intelligence bonus. Additionally, all your constructs receive the following benefits:

• +5 AC
• Resistance to 1 damage type of your choice, chosen when crafting the constructs. This choice can be changed during a long rest.