Blizzard announces the PTR for Diablo III will open Tuesday for a week of playtesting for Season 28 in the action/RPG sequel. As the release of Diablo IV draws nearer, Diablo III players are getting a new progression system called the Altar of Rites. Here are some details:

For Season 28, Rites of Sanctuary, we’re travelling deep into the mysterious ruins of the Festering Woods. Amid a hunting expedition, citizens hailing from New Tristram stumbled across an ominous Altar carved from an archaic material bearing cryptic markings. Shaken to their core by the eldritch aroma of the monolith, they’ve enlisted the assistance of brave Nephalem willing to investigate this sinister discovery that was once left to time—the Altar of Rites.

Home to power thought to be extinct from Sanctuary, the Altar of Rites will bestow these mystic forces upon worthy Nephalem. . .after a sacrifice is offered. You can begin interacting with the Altar of Rites at Level one.

Upon arrival at the Altar of Rites, players will see 26 icons called Seals and three Legendary Potion Powers.