What do you think this is?

[FNVcourierjon(SigilStone)]

I predicted it would be a sea urchin, but I was close.  They will release a snapshot today with these guys http://instagram.com/p/pYcww-pMHC/

It looks to me like a sea urchin with a fin (:
And it looks  like a Qwilfish


Fixed image - Tobs

[iGenerator]

That's pretty cool looking

[Tobs]

Apparently it's called the Elder Guardian and there is a bigger version in the underwater temples, it drops wet sponge. (according to Reddit)

[FNVcourierjon(SigilStone)]

Apparently it's called the Elder Guardian and there is a bigger version in the underwater temples, it drops wet sponge. (according to Reddit)

The smaller ones are called Guardians and they drop Prismarine crystals.  They have a ray attack

[~Hi45~]

That could be like one side and it could be a craken or colossal squid ^_^

Kraken* FWI not craken

[FNVcourierjon(SigilStone)]

Locked due to the mob having been revealed