With the final battle against the Lich King just on the horizon, Lead Content Designer Cory Stockton and Lead Systems Designer Greg Street discuss what awaits players inside Icecrown Citadel and offer a glimpse at the design process behind Wrath of the Lich King's ultimate raid and dungeon encounters.

What were you looking forward to most about developing Icecrown Citadel?

Cory: I think the most exciting thing about developing Icecrown Citadel was just knowing that we were working on the final chapter of the Northrend expansion, and that we'd really be able to give players that ultimate sense of completion of the storyline. Arthas is a huge character in Warcraft lore, so we took a lot of pride in making this the best experience we possibly could.

Icecrown and the Frozen Throne are important parts of the world of Azeroth and have quite a bit of history, especially for longtime Warcraft players. How do you convey the significance of these places and the events that took place there in design?

Cory: History was a large factor in the design of Icecrown Citadel from the very beginning. When we first sat down to discuss the layout of the raid itself, we immediately went back to Warcraft III: The Frozen Throne to think about how the spire from the ending cinematic could be translated into World of Warcraft. We decided to actually build Icecrown Citadel around the original spire to pull players even more into the storyline. This kind of thinking carried on throughout the entire design process.

Greg: We want Icecrown to be an epic experience from top to bottom, and that includes the loot you get. We're not going to shower players in items -- well, more than we already do -- but we do want to make sure the items are sufficiently powerful so that they're upgrades for all of our players.

Is there an existing model in World of Warcraft for Icecrown Citadel's itemization or style of play? What lessons that you'd learned from earlier projects wound up being applied to Icecrown Citadel?

Greg: The nice thing about Icecrown Citadel from an itemization perspective is that we have lots of bosses. That's something of a relief coming from the Crusaders' Coliseum, where we had only five bosses. For Icecrown, we can afford to have multiple options for a particular slot -- say a healing leather bracer or a melee trinket -- and even itemize some of the more unusual pieces. We have a pretty effective system for figuring out who is going to drop what to make sure that an individual boss will be interesting to a variety of players in terms of loot. Most of our lessons learned are in the realm of what differences there should be between 10- and 25-player itemization, the role of tradeskill recipes, and what kinds of items to place with badge vendors.

Cory: I think we learn lessons from every raid that we do. We didn't model Icecrown specifically after any of our previous raids, but you can definitely see influences. For example, we have a winged structure in Icecrown that players will remember from Naxxramas. Another example of an influence would be the teleporters from Ulduar. We know that players really loved that concept, so we brought it back in Icecrown.

Can you talk a little about how artists and designers on the team collaborated on the creation of Icecrown Citadel?

Cory: The design and art teams worked extremely closely throughout the entire development process. The biggest single influence on the look and the layout of the dungeon comes from our concept art, and there was no shortage of that for Icecrown Citadel. Once we locked down the layout, we were able to get to work on the final art extremely quickly thanks to the existing style we'd developed for the Icecrown zone. We really wanted the players to feel connected to the environment, but we wanted to make sure it still had an amazing look. Often times, these two things are hard to mix, but in this case, I think we've been able to pull off an amazing dungeon from both the art and design standpoint.

What sorts of new loot and item abilities will we see in Icecrown?

Greg: There are three main sources of loot for Icecrown: the bosses themselves, the Emblem of Frost badge vendors, and a new faction, the Ashen Verdict, that will provide suitable rewards as well, particularly at the Exalted level.

As far as the items themselves go, we want them to feel epic. In addition to having favorable optimization, we also want to try a lot of experiments to make the items feel cool and unique. We are going to try to do a lot of weapon procs, for instance, which is something we haven't done much since the original World of Warcraft.

When you set out to itemize "sister" areas -- like the Icecrown Citadel dungeon and raid, or Halls of Stone, Halls of Lightning, and Ulduar -- do you take any steps to make loot from these places feel similar?

Greg: Absolutely. We approach that on two fronts: the art and the names. When we did the Halls of Stone and Lightning, we hadn't completed the Ulduar raid yet, so the items there didn't necessarily have Titan-influenced art models for us to use. We are doing the Icecrown dungeon at the same time as the raid, and it's a style we already know pretty well, from Naxxramas and even the Warcraft RTS games.

Naming is something we've had a lot of fun with. There's a ton of lore to draw from for Icecrown loot and it has a very strong "kit." World of Warcraft players know to associate the Scourge with spiders, bats, and cultists along with more traditional forms of undead, like skeletons and liches.