[RPG] way for a sprite familiar to gain the senses of a Warlock such as darkvision

dnd-5efamiliarsvision-and-lightwarlock

A third level High Elf Pact of the Chain Warlock with an Archfey patron casts the find familiar spell and then chooses a sprite form for the spirit to take.

The Warlock commands the familiar to enter a dark cave, and can see with darkvision through the familiar's eyes. The sprite does not have darkvision and, therefore, either must have a light source or be guided by the warlock's commands (such as "go right 10'"). The sprite is blinded by the dark.

This was the implementation of the rules by the DM in the game situation which I agree with. After checking the Player's Handbook, I can't see any argument against this ruling. I want to keep the sprite familiar, and I rarely use the familiar in game, I keep it for specific situations, one of which could be the "dark cave" situation.

Is there a way for the sprite to gain the senses of the Warlock such as darkvision?

My question is about the possibility of a Plan B to enable a "ninja sprite" in this situation, either now or in the future.

Include abilities, magic items, feats and spells which can be accessed at higher levels (including multi-classing) that might help, and also include tactics for different ways to use the familiar in this situation. I would prefer to exclude
the option for the familiar to take another form such as pseudodragon to avoid the "choose a different familiar" option for role-play reasons.

The DM already ruled on the question posed here, so I would need some more evidence before going to "ask the DM" again about the ruling. The best answer could be: "No, there is no Plan B, your sprite will always enter a dark cave blinded, go with it and enjoy the challenge!".

Best Answer

Sure: familiars can use magic items. Goggles of night grant darkvision.

I do want to provide a bit of a frame-challenge, though. You say

... but exclude meta-gaming options such as "choose a different familiar".

Now, in some ways this is setting/game/table dependent, because different people have different ideas of what a magic users' familiar should be (in a mythic/essential sense), but in the rules, it's clear that the familiar is a spirit which happens to take on a particular form, and in the find familiar spell, there is this explicit phrase:

If you cast this spell while you already have a familiar, you instead cause it to adopt a new form.

This isn't "choosing a new familiar" — it's simply shaping the one you have into a different form. So, by a vanilla rules reading, this is totally copacetic — making the familiar's form be a single, permanent choice is a house rule.

It is, however, very understandable from a story or setting point of view to say "my familiar is a cat", or a raven, or (obviously in this case) a sprite. There is plenty of literature and folklore where familiars are specific animals, not shape-shifting nature spirits. If I were the DM, I'd consider offering you this option: when you cast find familiar while your familiar is already present, you can choose to alter its (magical) abilities while keeping its form. In this case, you would swap out your sprite's Heart Sight and Invisibility for Flyby and Keen Hearing and Sight (with darkvision).

I've never had a player ask to do this in a game of mine, but I've had a similar situation with a druid who wanted to keep a particular shifted form but not completely hobble that class's versatility. Since really all you are doing is changing the visible description of the familiar, there aren't any game balance (or "metagaming") concerns, and you can keep true to the story you want for your character.

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