Challenge modes will be making an exit with the launch of Patch 6.0.2 -- players looking to get their Challenge Mode gear should do so before the patch hits. But one of the sometimes overlooked bonuses of Challenge Modes is going away as well. The Thundering Serpent Hatchling, a reward from the Challenge Conquerors: Gold - Guild Edition achievement, will also be taking its leave with the release of the patch, according to a tweet by Senior Game Designer Jonathan LeCraft.

@CKarner The ability to buy the hatchling is going away in 6.0, so buy it now.- Jonathan LeCraft (@TheCrafticus) September 17, 2014

Players might not know about this sparky little Battle Pet, especially if they've recently joined a guild. The Thundering Serpent Hatchling isn't rewarded solely to the people that earned the achievement for the guild, it's a pet that is unlocked on the Guild Vendor. Anyone with at least Revered guild reputation can purchase it, but the serpent cannot at this time be caged -- which means you aren't going to find this little guy floating around on the Auction House. If you haven't picked him up yet, you might want to do so now -- because there's been no mention made of any possible future return.