Today's scheduled maintenance for Heroes of the Storm in North America concluded sooner than projected, and Blizzard's MOBA is once again online, offering the first installment in the Diablo-themed Eternal Conflict update, including a new map and the playable Butcher character. The Patch Notes outline all the changes. Here's word on the new map:

The conflict between the High Heavens and the Burning Hells has spilled into the Nexus, breeding a new Battleground that is equal parts righteous and wicked. Angels, Demons, and now Heroes clash in ceaseless combat in their struggle for dominance over the Battlefield of Eternity.

• Battlefield of Eternity is a two-lane Battleground featuring two massive Immortals that battle endlessly at its center, and teams must compete to defeat the opposing Immortal.
• Once its foe has been toppled, the victorious Immortal will be restored to full Health, and proceed to seek out enemy Structures, attacking down the lane with the most remaining defenses.
• An attacking Immortal will also gain a Shield, proportionate to the amount of Health it had remaining at the end of the battle.
• The Immortal will perform ranged attacks, which each consume a portion of its Shield. Taking damage will also drain the Immortal’s Shield.
• Once its Shield has been expended, the Immortal will only attack at melee range.