The 'Across the Threshold' seasonal quest in Diablo 4 Season 14 requires players to find and defeat a Realmwalker, a powerful Pandemonium creature. While Realmwalkers may spawn after completing Surging Rupture events, the most reliable method is participating in the 'Realmwalker' world event that occurs periodically southeast of Zarbinzet, which guarantees a spawn.

During the world event, players must keep three Ruptures open simultaneously for a set duration, with the option to coordinate with other players or complete it solo. Once this requirement is met, the Realmwalker emerges in the arena centre. Players must then destroy three pillars that appear during the fight to prevent them transforming into more dangerous Realmbreakers. After defeating the boss, a portal opens to the Deathtoll Chamber, where players expand a ritual circle by defeating enemies before conversing with Dannica to complete the quest.