Talk:The Sacrifice/@comment-114.124.215.23-20180524052907

Based on https://www.warframe.com/game/questguide (May 24th, 2018, 05:24 GMT), Saya's Vigil is not part of this quest's requirement. This means only 10 quests are required for The Sacrifice. If we assume the 10 quests are the main storyline quests, this makes The Sacrifice the 11th main quest.

On the Trivia, it states that there is a Lambda symbol on the quest's teaser image. Based on https://en.wikipedia.org/wiki/Lambda, Lambda is the 11th letter of the Greek alphabet. If the previous assumption is followed, that this quest is the 11th main quest, it would explain the meaning of the Lambda symbol.