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.