Unknown creature, looking for name and stats

[thywolf]

My DM toss a creature invasion at us he called a shadowling. They are 'living' in the underdark, I don't know if they are from the forgotten realms or not. but it suppose to look something like a displacer beast, or as he described the big ass 'wolf/lion' black thing in the movie Avatar, six legs and all. His creature burn in the light, and can turn incorporeal in the darkness, they are very intelligent creatures and work on a hive mind system as well, the hive mind creature has 3 eyes on it's head. If bitten by one you are infected and go insane til, 12 of these creatures burst out from inside you.

any ideas?

 

[Shade]

Displacer beasts originally had six legs back in 1st edition. I don't recall a sunlight vulnerability, though. I suspect it was a homebrewed creature or a templated displacer beast. It has some traits similar to the following:

Shadow Panther

Umbral Displacer Beast (Libris Mortis)

I can't think of any official creatures with the "burn in sunlight" and "insanity bite/bursting young" abilities.

I'm unfamiliar with 4th Edition, so it's possible it is a newer creature.