Update on the species being open: Currently still in development for their information etc! Hang in there :D
If you are interested in making a Slugubus, please contact me/send me a dm! I've got a Deviantart group under construction + google document containing the same information :) any questions or specifics about anything, I'm more than happy to answer!

Bog
~MOSTLY SQUISHY, including his "horns"
~ Phosphorus symbol on his chest
~Eyes and his dark yellow areas canonically glow in the dark (including his shell)
~Drool is numbing (also glows in the dark! Though his is faint), and blackish-dark grey in colour!
~Technically both male and female sexes, but identifies as male (he/him and they/them pronouns :) )
~Shy and timid but kind
~Canto loves hanging out with them to relax
~Bog loves watching Dregs make spells
~Quag teases them the most cause it's easy to get him flustered and she thinks it's "cute"
~Prone to social anxiety and when nervous/embarrassed they tend to "disappear" in a cloud of smoke
~Produces smoke out of tubed spines and his "horn"

Other Slugubi mentioned:
Canto: https://www.furaffinity.net/view/35509686/
Dregs: https://www.furaffinity.net/view/24270813/
Quag: https://www.furaffinity.net/view/42924042/