Talk:Okeanos/@comment-25402775-20190307062604/@comment-28242634-20190307070506

It means some story related Servants are summonable in "story summoning gacha" if you beat the campaign.

For example, beat the Camelot chapter, then Gawain, Tristan and Bedivere will be available to get in story summoning gacha. However, they are only exclusive to that gacha, and are not available to event gachas, unless they are mentioned to be there.