Bethesda sent out the following
The Chaos Arena monthly special event returns to The Elder Scrolls: Legends as Sheogorath, the Elder Scrolls’ legendary Daedric Prince of Madness, takes over and brings back the limited-time PvP mode to the strategy card game. Chaos Arena alters competitive gameplay by introducing one or more random special scenarios or lane rules into each match. Players will need to adapt their strategies on the fly in every game, accounting for moving cards, surprising bonuses, and possibly crippling effects.
As an added bonus, players that log into their The Elder Scrolls: Legends account during the event will receive a free card pack, regardless of whether they play Chaos Arena. Card packs will be delivered shortly after the event ends.
The Chaos Arena special event is live now and will continue until Monday, January 23.
This is a really cool event Bethesda is doing, and it is all due to good fan reception. Hopefully more events are done in the future for the game. I was skeptical of Elder Scrolls Legends at first, but it has since come into its own.