In general, this pet (along with the Ghostly Skull) seems to be the fallback for other, less attainable,0 Undeads. Don’t have an Unborn Valkyr? Use a Ghostly Skull! Don’t have a Crawling Claw? Try the Creepy Crate! While he may be second choice in a lot of battling situations, he has extremely unique animations and a seasonal questline to pursue. And, he’s one of the very, very few pets not acquired by capture which isn’t cageable, so if you want one your only option is to complete the questline during Hallow’s Eve.
Go to the AH and buy 2 Strange Dust right now, before somebody buys them all up and lists them for 500g a pop! I’ll wait. Aw, somebody already did? It, um, it might have been me. Sorry. Well, not really. Find a lowbie enchanter friend who doesn’t know any better or something and come on back.
The quest starts at the main inn in your capital city, either the one where Gamon always got creamed in Orgrimmar or the one in the Trade district in Stormwind. You’re directed to find a courier in the harbor of each city.
He’s fairly dead. Disgustingly, you’re directed to follow a trail of bright pink glowing spiders to the auctioneer who fenced the goods stolen off the courier after he was murdered.
That auctioneer didn’t actually take the goods though, so you’re directed to somebody else in a shady part of town, again via spider trail. The quest giver who awaits you sends you to go get stuff to make a potion to protect you from the box, because boxes are dangerous sometimes. This is where that strange dust I mentioned earlier comes in. You need to visit a vendor for some vials. If you have a mount with vendors, you can buy the vials there. You also need to head to either the Tauren area in Orgrimmar or the farm sort of near the Cataclysm portals in Stormwind to gather the quest herbs.
After creating the potion, it’s time for the showdown. Horde hop the Zeppelin to Undercity and have a confrontation in the ruins of Lordaeron. Alliance go to the Cathedral of Light, into the catacombs on the right hand side. There will be another path of purple spiders, so if you get lost backtrack to the point you last saw them and follow them. There will be an NPC there, channeling a purple looking thing while standing over a crate. If you’re on a high-pop server, you may need to wait for ‘the confrontation’. Eventually he spawns 2 voidwalkers, and as long as you get an attack in on one or the other the quest should complete.
After this, you have to make one last choice. If this is the first time you’re running through I won’t spoil it for you, because regardless of that choice, you’re then left with the Creepy Crate.
As noted above, the Crate is sort of a fallback pet. For force swaps, its health breed makes it slightly less useful than the speedy Bone Spider, and its Curse of Doom shares a slot with its Death Grip, making it a bit less deadly than the Crawling Claw on a force swap team. Its Curse of Doom hits for far less than many other pets, and with its only heal being Devour it isn’t so hot as a tank pet. Its most unique ability, BONESTORM, doesn’t help its position as a tank either. On a 3-round cooldown, you can use bon–excuse me–BONESTORM to deal 200 damage to the entire enemy team, but only by sacrificing 10% of your total health.
The other thing it shares with the Ghostly Skull is, when you acquire it, it starts off as Uncommon. Because it’s untradeable as well, you will want to save an undead upgrade stone if you intend to use him full-time.
The Crate doesn’t take this second-class citizen stuff lying down. In its jealousy and the insatiable hunger the quest warned you about, it will frequently use its Death Grip ability as a companion pet to eat other critters roaming around. When it does, each pet consumed by your crate will count toward Crittergeddon.