ZeniMax Online has released a new The Elder Scrolls Online trailer showcasing the game's upcoming 12 player trails, set to be added in the post-launch Craglorn update.
There's also an accompanying blog post in which developers ZeniMax go into more detail about the creation and function of these larger instances.
"One of the first things you’ll notice about Trials is that they bring a new experience to ESO designed to test even the toughest veterans," reads the blog post. "You’ll need a group of 12 to take them on, but they’re not just dungeons that require a large group—we’re applying additional pressure. Your team will only have a limited number of resurrections available, and additional rewards will be granted to those who defeat the weekly challenge with one of the top times across the megaserver."
Despite the risks, though, ZeniMax promise some impressive rewards. "OK, so Trials are tough. Really tough. But what do you get for putting in all the effort to overcome them? First off, we put a great deal of work into making Trials visually spectacular. You’ll visit some of the most stunning places in (and outside of) Tamriel through them, and the boss encounters are the most intense spectacles you’ll see in the game. You’ll see the culmination of Craglorn’s story as you face the Celestial Mage and Warrior. And, of course, there’s plenty of remarkable loot to be had."