How to revive an Artificer’s Homonculus Servant?

So, I’m a little bit confused here. On ERLW pg. 62, from the Homunculus Servant entry, it reads;

“The item you infuse serves as the creature’s heart, around which the creature’s body instantly forms.”

And it continues on to say;

“If it dies, it vanishes, leaving its heart in its space.”

Given this, I can see two distinct possibilities. 1. The infusion fades and you must infuse the gem again. 2. The infusion remains, and its body reappears after it regains hit points.

Since it doesn’t indicate the infusion fades, I’m leaning towards the second option, but I’m not sure. Which case is it, or is it some other option I haven’t considered?

What reactions are available to an artificer’s homunculus servant?

The description of the artificer’s homunculus servant states:

In combat, the homunculus 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 the action in its stat block or the Dash, Disengage, Help, Hide, or Search action.

The homunculus has a limited number of action options in combat, and most require the artificer to use their bonus action on their own turn. This (closed) question lists the reactions that are generally available in the game, but the homunculus can’t have feats, use the Ready action, or take an Opportunity Attack.

Yet the rules specifically go out of their way to mention that the homunculus can “use its reaction on its own”.

Question: what reactions can it use?

Can an artificer heal a homunculus servant at range?

In the official version of artificer, the ability to create a homunculus servant is gained at 6th level. Among its other abilities, the homunculus can:

Channel Magic The homunculus delivers a spell you cast that has a range of touch. The homunculus must be within 120 feet of you.

Further:

The homunculus regains 2d6 hit points if the mending spell is cast on it

Mending has a range of touch. Is there any reason an artificer cannot use the spell to repair his homunculus servant so long as it is within 120 feet?

Can an Unseen Servant be used as a scout?

The Bard in my game knows the spell Unseen Servant, and I’m not sure of its limitations. The PHB (284) says:

This spell creates an invisible, mindless, shapeless force that performs simple tasks at your command until the spell ends… Once on each of your turns as a bonus action, you can mentally command the servant to move up to 15 feet and interact with an object. The servant can perform simple tasks that a human servant could do, such as fetching things, cleaning, mending, folding clothes, lighting fires, serving food, and pouring wine. Once you give the command, the servant performs the task to the best of its ability until it completes the task, then waits for your next command. If you command the servant to perform a task that would move it more than 60 feet away from you, the spell ends.

A few questions here:

Can this mindless force scout around a corner and report back what it sees? This task seems like a “simple task that a human servanct could do”, but I’m not sure if this servant can communicate. If it can, I presume it doesn’t have darkvision. I don’t see why it would, and it isn’t specified that it does, but I figure I’d check. If it can scout and communicate, would it communicate back to its Bard master telepathically the way that the Bard communicates with it?

How does Might of the Master for the Homunculus Servant REALLY work?

So I have a question about Might of the Master. Might of the master says this:

The following numbers increase by 1 when your proficiency bonus increases by 1: the homunculus’s skill and saving throw bonuses (above) and the bonuses to hit and damage of its attack (below).

However, that is pretty vague now that it isn’t a core class trait. When it was a UA Artificer class skill, it was given to you as an Alchemist at level 3. So I had assumed that meant that it would get +1 to all the traits from that point on whenever you increased your proficiency modifier. Thing is, it isn’t given to you anymore. It’s an infusion you can choose at level 6. So… does your homunculus:

1) get your proficiency bonus as a whole added to its stats (so +3 to everything at level 6, increased to +4 at 9, +5 at 13 and +6 at 17),

2) does it get +1 to its stats every time your prof increases from the point when you make it (so if you made it at level 17, it never gets any better than its base stats because your proficiency modifiers never increase from then on), or

3) does it get +1 to its stats from every point your proficiency increases from when you COULD make it (level 6 on)?

What do you all think? Because it got a whole lot more vague when it didn’t become a core class feature.

Does the spell Unseen Servant count as taking the “Help” action for Artificers or any crafters building or repairing things?

Does the spell Unseen Servant count as taking the “Help” action for Artificers or any crafters building or repairing things?

I understand that Unseen Servant can do basic tasks, but the spell states:

The servant can perform simple tasks that a human servant could do, such as fetching things, cleaning, mending, folding clothes, lighting fires, serving food, and pouring wine. Once you give the command, the servant performs the task to the best of its ability until it completes the task, then waits for your next command.

So while not being able to help you build, it can help you fix (mending) things or just assist by retrieving and stowing tools. Is that enough to grant you advantage to you crafting or repair checks?