...we're not killing off any of the companions because everybody did. And then everybody cried... People test as they're playing the system and they go... 'I wonder if they're going to let me do this. Oh no! My healer is gone forever'!
Also frequently referred to as being "missable," the dreaded Lost Forever is a game play component (such as an item, weapon, Sidequest, character, or plot event) that can become permanently inaccessible after a certain point in the game, therefore being "lost forever" if you miss them during the period in which they are available. A close relative and often an example of Guide Dang It. The bane of gamers everywhere, especially those shooting for 100% Completion, as it often forces them to start the entire game anew if they're not willing to accept a less-than-perfect run.