OAKLAND, Calif. — The Golden State Warriors may never play another game at Oracle Arena, the concrete relic they call home, but that is suddenly a secondary concern at best for the N.B.A.’s reigning but reeling champions.

The Toronto Raptors moved to the brink of their first N.B.A. championship Friday night by outlasting the favored Warriors, 105-92, in a Game 4 slog. Fueled by a Golden State-style haymaker in the third quarter, Toronto seized a three games-to-one series lead to take back to Canada for Monday night’s Game 5.

The Warriors and their fans, who have reveled in three N.B.A. titles in the past four seasons, understood what was at stake on this night perhaps better than anyone else. A three games-to-one lead in the best-of-seven finals has led to 33 titles in 34 prior finals series. The only exception: Golden State’s loss against LeBron James and the Cleveland Cavaliers in 2016.

The Warriors will now need their own Cleveland-style comeback to ensure that their dynasty of the past half-decade — as the first N.B.A. team to make five successive trips to the finals since the Boston Celtics in the 1960s — does not end in defeat. They could also clearly use Kevin Durant, who was expected to have returned by now from a strained right calf.