Base Class: Artificer
A artificer who specializes as an Armorer modifies armour to function almost like a second skin. The armour is enhanced to hone the artificer's magic, unleash potent attacks, and generate a formidable defence. The artificer bonds with this armour, becoming one with it even as they experiment with it and refine its magical capabilities.
Tools of the Trade
When you adopt this specialization at 3rd level, you gain proficiency with heavy armor. You also gain proficiency with smith's tools. If you already have this tool proficiency, you gain proficiency with one other type of artisan's tools of your choice.
Armorer Spells
Starting at 3rd level, you always have certain spells prepared after you reach particular levels in this class, as shown in the Armorer Spells table. These spells count as artificer spells for you, but they don't count against the number of artificer spells you prepare.
Arcane Armour
Beginning at 3rd level, your metallurgical pursuits have led to you making armor a conduit for your magic. As an action, you can turn a suit of armor you are wearing into Arcane Armor, provided you have smith's tools in hand.
You gain the following benefits while wearing this armor:
- If the armor normally has a Strength requirement, the arcane armor lacks this requirement for you.
- You can use the arcane armor as a spellcasting focus for your artificer spells.
- The armor attaches to you and can’t be removed against your will. It also expands to cover your entire body, although you can retract or deploy the helmet as a bonus action. The armor replaces any missing limbs, functioning identically to a body part it is replacing.
- You can doff or don the armor as an action.
The armor continues to be Arcane Armor until you don another suit of armor or you die.
Guardian
You design your armor to be in the front line of conflict. It has the following features:
- Thunder Gauntlets. Each of the armor's gauntlets counts as a simple melee weapon while you aren't holding anything in it, and it deals 1d8 thunder damage on a hit. A creature hit by the gauntlet has disadvantage on attack rolls against targets other than you until the start of your next turn, as the armor magically emits a distracting pulse when the creature attacks someone else.
- Defensive Field. As a bonus action, you can gain temporary hit points equal to your level in this class, replacing any temporary hit points you already have. You lose these temporary hit points if you doff the armor. You can use this bonus action a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.
*Give yourself custom thunder gauntlets
Extra Attack
Starting at 5th level, you can attack twice, rather than once, whenever you take the Attack action on your turn.
Armour modifications
At 9th level, you learn how to use your artificer infusions to specially modify your Arcane Armor. That armor now counts as separate items for the purposes of your Infuse Items feature: armor (the chest piece), boots, helmet, and the armor's special weapon. Each of those items can bear one of your infusions, and the infusions transfer over if you change your armor's model with the Armor Model feature. In addition, the maximum number of items you can infuse at once increases by 2, but those extra items must be part of your Arcane Armor.
Perfected Armour
At 15th level, your Arcane Armor gains additional benefits,
When a Huge or smaller creature you can see ends its turn within 30 feet of you, you can use your reaction to magically force it to make a Strength saving throw against your spell save DC. On a failed save, you pull the creature up to 25 feet directly to an unoccupied space. If you pull the target to a space within 5 feet of you, you can make a melee weapon attack against it as part of this reaction.
You can use this reaction a number of times equal to your proficiency bonus, and you regain all expended uses of it when you finish a long rest.