This is a guide showing the locations of all the Sprodlings in the Vallis Undermind. As of writing this, I'm assuming there are 7 in total, as I haven't seen more. Here's a bit of information on the Sprodlings:

• Sprodlings will always spawn in their respective tiles.
  
• Each Sprodling drops a specific Cave Art blueprint, which is used to make a Cave Art decoration. They don't seem to serve any gameplay purpose beyond that.
  
• They show up on the loot radar.
  
• If you're not the host in a lobby, you won't be able to pick them up! I'm assuming this is a bug that'll be patched... eventually? For now, unless you're hosting a lobby or running solo, don't bother looking for them.
  
• And yes, you can collect them all in one run:

I've organized the guide in alphabetical order by the Cave Art name, which you can see in the image above to know what you're missing.

This location seems to be a guaranteed spawn, as it's connected to the first large room you enter in the Vallis Undermind. From spawn, head left into the tunnels until you find a tall room with a frozen coolant column in the center. Head to the very top of the room and you'll find the Sprodling.









Just as a note, there's a similar-looking frozen coolant room that can randomly spawn as a dead end- this is NOT the room you're looking for, although it looks similar!

This is a guaranteed spawn and is found in the room just outside the elevator. At the end of the broken bridge from the elevator side, there's a ladder connecting it to nearby rocks. From that ladder, head up the roots and mushrooms until you see a cave entrance to the left, and that's where the Sprodling is.



This is the view from the large mushroom on the opposite wall.

For this, you're looking for a large room that contains a lot of pipes, a door (if you know you know), and flowing coolant at the bottom. Head down to where the jump flower is and look down at the coolant. Off to the left, there's a tunnel. Aim glide or parkour through this tunnel and you'll reach the Sprodling.

A view from the highest platform, just outside the door.

For this, you're looking for a spot where several tunnels intersect. There's an elevated area here with a big light by the rock in the center. Face the light from the tunnel on the elevated ground and you'll see a hole in the rocks with some cave art beside it. Head in, and the Sprodling is there.

Here's the hole from this view:


Minimap view:

This location had a dead giveaway, and that's a Somachord along with a bunch of chests showing up just outside the bend of the tunnel. If you see this Somachord somewhere that isn't in a room, it's likely this one because there are only three Somachords (as of right now) in the Vallis Undermind, and this is the only one that's out here like this. In the tunnel's bend, there's a small opening. Crawl inside and you'll see a broken container with the Somachord and Sprodling. Two for one deal.

This tunnel is connected to a room with an empty container hanging by some roots in the center, as you can see here:


Apologies for the image, I was trying to show the minimap but forgot to show the entrance, so it's circled here. The circle isn't related to the minimap, just where it is on the rock wall I'm facing:

This room MIGHT be connected to the same room that the Lookout Cave Sprodling is, but I'm not 100% certain. It might have just been luck that they were connected in the game I got these screenshots. The map for it kind of looks like a screaming face, or just a square if you're normal. Anyways for this you're looking for a cave with some broken containers in it. There's a large mushroom near them, and there's an opening in the rocks just to the left of it. Inside is the Sprodling.



Minimap view:

This room is rather large, and there's a rock in the center with a platform running around half of it. That platform has cave art just above it, and there's really nothing else in this cave that gives it away. Above the right end of that platform is an opening in the rocks, which is where the Sprodling is.

Thanks for checking this out. If there's any confusion or you have any suggestions, please let me know. I know the screenshots aren't the greatest, but if they work then they work and if they don't, let me know. It's not a super in-depth guide but if you need any additional help, there are videos online that might be of more help. I found that Ninjadeath 721's videos on YouTube were quite helpful when I was looking for the final Sprodling that I was missing. They have individual guides for every location, here you go:

• Adventure Walk
  
• Deep Roots
  
• Fairy Ring
  
• Lookout Cave
  
• Root Maze
  
• The Prince
  
• Undermind Whispers

As a final note, I'll likely expand this guide to include some of the other secrets like Somachords and the doors if nobody else does it.