After 12 years and six expansions, World of Warcraft players might think they had defeated all the enemies Blizzard could throw at them, but according to the developer that isn't the case.

Speaking with Polygon, World of Warcraft senior art director Chris Robinson said there were plenty more potential threats still to come.

"We get into rooms to talk about the future," he said. "From our perspective, it always feels like we have too much stuff to cover still. There’s a whole level of titans and old gods that we’ve kind of touched on, but we haven’t really dug into a lot of that stuff."

Players have encountered both titans and old gods previously: old god C'thun was the last boss of the Temple of Ahn'Qiraj in the original game, and Yogg-Saron was encountered during the Wrath of the Lich King expansion, though neither were as iconic as Arthas, Cataclysm's Deathwing, or the Lich King himself.

The game's latest expansion Legion, which released today, features one of the franchise's most iconic antagonists, Illidan Stormrage, returning after his defeat in The Burning Crusade. This time however, he's back to support players by leading the faction of demon hunters, who feature as a new playable class.

However, Robinson says a lead antagonist isn't a necessity for an expansion.

"It’s nice from an illustrative perspective to have a big bad guy to post on the box and make it simple," said Robinson. "But I don’t think it’s a rule that we’ve ever said we have to have that. Nor would I say that we feel like it’s even a necessary part of an expansion.

"It’s more a question of if it fits when we’re sitting down and jamming out what would be cool for the next expansion. If there’s that kind of set bad guy that we’ll be going up against, then we do that. But there’s a ton of other ways that we could do these things that we talk about on a daily basis, and I think we probably will end up doing expansions that don’t have one antagonist."

World of Warcraft: Legion is available for PC; players can grab a copy now at Mighty Ape.