The invisibility extends to players as well as mobs. Did a sahha match and one player on the opposing team was invisible. Distance wasn't an issue as others were in front of and behind this player. I only knew this player was there because their name was on the screen. Invisibility for only this player persisted when the ball was in play and everyone was moving around.
Another time I only knew a player was there because I saw a companion moving around...eventually saw the name of the player it was following. That player moved all around the area and only became visible once.
Quest givers, as shown upthread, come in and out of invisibility. My partner, playing beside me had one go invisible several metres aways whereas it was invisible to me sitting right beside it at the same time on our different screens.
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Another time I only knew a player was there because I saw a companion moving around...eventually saw the name of the player it was following. That player moved all around the area and only became visible once.
Quest givers, as shown upthread, come in and out of invisibility. My partner, playing beside me had one go invisible several metres aways whereas it was invisible to me sitting right beside it at the same time on our different screens.