Dungeons And Dragons Online: Monster Journal #5: Iron Defender @ Official Site

Hah, and you thought it was coming out yesterday, didn't you? Well, I guess we all did, but we're more than happy to wait for the Iron Defender. A mob, which I believe, is unique to Eberron. Here's a snippet:

While resembling a dog in form, the iron defender could never be mistaken for a living creature. Composed of iron plates and bars, this construct creature has become increasingly easy to find among ruins and dungeons of Xen'drik. Wizards and sorcerers have long used them to protect hidden stores of treasures for years, but of late adventurers have reported finding these cheaply-produced constructs in areas where no intelligent life could be found, still patrolling and following the orders of some long-lost creator.

Certainly not what I had expected when Sporkfire hinted canine. Check out the journal, description, and imagine of the critter here.