Reminder to loot your sigils from Hodir, Thorim, Freya and Mimiron Hardmode's
Only triggers if you're on the sigil quests AFTER the Archivum Data Disc turn in:
10M - https://www.wowhead.com/wotlk/quest=13604/archivum-data-disc
25M - https://www.wowhead.com/wotlk/quest=13817/heroic-archivum-data-disc