Armies require protection, and someone has to put things back together if defenses fail. A combination of protector and medic, a Battle Smith is an expert at defending others and repairing both material and personnel. To aid in their work, Battle Smiths are usually accompanied by a steel defender, a protective companion of their own creation. Many soldiers tell stories of nearly dying before being saved by a Battle Smith and a steel defender.
Battle Smiths played a key role in House Cannith's work on battle constructs and the original warforged, and after the Last War, these artificers led efforts to aid those who were injured in the war's horrific battles.
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.
Starting at 3rd level, you always have certain spells prepared after you reach particular levels in this class, as shown in the Battle Smith Spells table. These spells count as artificer spells for you, but they don't count against the number of artificer spells you prepare.
3rd level - Heroism, shield
5th level - Branding smite, warding bond
9th level - Aura of vitality, conjure barrage
13th level - Aura of purity, fire shield
17th level - Banishing smite, mass cure wounds
When you reach 3rd level, your combat training and your experiments with magic have paid off in two ways:
By 3rd level, your tinkering has borne you a faithful companion, a steel defender. It is friendly to you and your companions, and it obeys your commands. See this creature's game statistics in the steel defender stat block. You determine the creature's appearance and whether it has two legs or four; your choice has no effect on its game statistics.
In combat, the steel defender shares your initiative count, but it takes its turn immediately after yours. It can move and use its reaction on its own, but the only action it takes on its turn is the Dodge action, unless you take a bonus action on your turn to command it to take one of the actions in its stat block or the Dash, Disengage, Help, Hide, or Search action.
If the mending spell is cast on it, it regains 2d6 hit points. If it has died within the last hour, you can use your smith'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 steel defender returns to life after 1 minute with all its hit points restored.
At the end of a long rest, you can create a new steel defender if you have your smith's tools with you. If you already have a steel defender from this feature, the first one immediately perishes.
Starting at 5th level, you can attack twice, rather than once, whenever you take the Attack action on your turn.
At 9th level, you learn new ways to channel arcane energy to harm or heal. When either you hit a target with a magic weapon attack or your steel defender hits a target, you can channel magical energy through the strike to create one of the following effects:
You can use this energy a number of times equal to your Intelligence modifier (minimum of once), but you can do so no more than once on a turn. You regain all expended uses when you finish a long rest.
At 15th level, your Arcane Jolt and steel defender become more powerful: