Place this clip right on the cut into a new area, after a pop sfx for the menu confirm and before an enemy spotted cue when combat starts on the other side, so the sequence reads as select, travel, then threat.
Über diesen Sound
This is a very short portal entry effect lasting under a second, a bright magical whoosh and shimmer that signals instant travel from one place to another. It feels energising and otherworldly, giving a small moment a sense of arrival and adventure. The clip is drawn from in-game portal use in D2.