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The Darkvision spell, by default, can target only one creature and gains no benefit from upcasting (= using a spell slot higher than the spell's level).

You touch a willing creature to grant it the ability to see in the dark. For the duration, that creature has darkvision out to a range of 60 feet.

Since my level 7 moon druid has two party members without darkvision, I asked my DM if he could allow me to cast darkvision at higher levels to target additional creatures; more precisely, one additional target for each spell slot level above 2nd (similar to spells like Charm Person or Hold Person).
For example, if cast at 3rd level, I can target two creatures, while casting it at 5th level would allow me to target 4 creatures, and so on.

Anyways, he did choose to allow it, and I've used it a number of times so far. However, since allowing this spell to be upcast is so intuitive - I was really surprised when I found out it wasn't possible by RAW - I can't help but wondering if there are any balancing issues to allowing the upcasting of the spell.

To be clear, I'm not asking why the designers didn't allow upcasting the spell, though the answer to my question might easily overlap with the designers' reasons.
What I want to know is whether or not any balancing issues exist that should prevent me / my DM (I also DM occasionally) from houseruling that it is possible to upcast the spell.

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    \$\begingroup\$ I wish every single targer spell could be upcast that way. \$\endgroup\$ – András Jan 3 at 17:42
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    \$\begingroup\$ @Andras Yeah, it would be nice if 5e didn't hate buffs as much as it does. \$\endgroup\$ – Miniman Jan 3 at 20:52
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Darkvision is a very situational ability, so the issues caused by having this ability will probably depend on how important darkness is.

It's exceptionally easy to end up with a party where every member has darkvision (both of my current groups are in this boat!), unless the DM places some restriction on darkvision-having races. Because it's available to so many races by default, and because it requires a spell slot, this is perfectly balanced. If anything, it may be unbalanced against you, as it takes up spell slots.

It could easily be very powerful in a campaign like Out of the Abyss, if most of the party didn't have darkvision, but that's a unique campaign with a literally very dark setting.

Of the races available in the PHB, 6 of the 9 have darkvision as a sense. This is something that is easily available to the majority of players from level one, and therefore, is exceptionally unlikely to create an unbalanced situation.

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I find it best to think about balancing questions by putting the alternatives side-by-side and asking "Is one clearly superior to the other - that is, would I always choose this over that?" If the answer is "yes" then its unbalanced.

The follow up question is more subtle - "Are there situations where I would always choose option A and situations where I would always choose option B and rarely or never situations where I would choose neither?" If the answer is "yes" then the solution may be unbalanced because it turns a sometimes useful ability into an always useful ability. It is not necessarily unbalanced because there may be limitations that prevent abuse. For example, spell slots fall into the category of always being useful but they are limited by number of uses.

So, lets see how your options stack up:

  1. Use 2 2nd level spell slots (out of 3 total at 7th level), or
  2. Use 1 3rd level spell slot (out of 3 total at 7th level).

To me this is a no brainier - I would always use the 3rd level slot. Therefore, its unbalanced.

However, if instead of 1 person per higher level slot you had 1 person for every 2 slots higher the calculation becomes:

  1. Use 2 2nd level spell slots (out of 3 total at 7th level), or
  2. Use 1 4th level spell slot (out of 1 total at 7th level).

No the decision is not so clear - 4th level slots are powerful and I'm giving up my only one but 2 2nd levels are more flexible. Hmmm. Now we're starting to look balanced. Particularly when you consider that as you go up in levels you get more 3rd level slots (2 at 8th and 3 at 9th+). Having the relative advantages change as you level up is also a good indicator of balance.

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    \$\begingroup\$ I don't think using a 3rd level slot over two 2nd level is a no-brainer. Depending on your spells, 2nd-levels might be near-worthless, while 3rd-levels aren't. Also, I don't think the logic of "if a) is better than b), then a) is overpowered" is correct, at least not when it comes to upcasting spells. Check out the 1st-level Longstrider spell, which gives one creature +10 speed for 1 hour, no concentration. Still, you can upcast it to target +1 creature for every slot level above 1st - basically the same situation as with darkvision, except one spell level lower. \$\endgroup\$ – PixelMaster Jan 4 at 1:55

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