I call him, Octojelly Sandy!!

Here is my adorable eldritch abomination Sandy we could say, the equivalent to  tentacle shadow monster Pitch

His design comes from Jellyfishes and octopuses

Sandmansanderson mansnoozierise of the guardiansROTGblacksandFOR REASONSthat long tentacle thing is actually called oral armthere is so many weird things about this nowoctojelly sandythings that would give Pitch a boner