You can actually find these on Valguero. There is an artifact cave called Milton’s Grotto at 78.2, 90.4. There is a little memorial to a modder’s dog that died inside the cave and at the memorial sometimes shinehorn spawn (along with the other three light pets).
Shinehorn
The Shinehorn is a small bioluminescent shoulder pet that lights dark places and helps repel Nameless, making it a valuable companion for hazardous exploration.
More Shinehorn Encountering Tips
If u kill these ur a monster
It's a goat not a deer. The more you know.
I found some in the blue jem cave in fjordur
a VERY helpful tip… NEVER KILL THEM EVER!!!
You kill one and reapers come for you
Shinehorns smell fear just know that
I found it in a hole it looked at me I stuffed mushrooms up it's butt and it was my best friend
Very dangerous, if sighted then run they may have short legs but they're the fastest creature of all, don't fall for the cuteness ~ Someone who fell for the cuteness
So I believe you should KILLL this thing
I'm JOKING PET IT