Remedy for Remembering is the quest we find when we first send Leif to the Frost Owl Spire. Presumably this occurs at or near the end of the Seeking Clues questline, which would generally cause this questline to follow hot on its heels. Here again, as with previous quests featuring Leif, we are chasing down keys to his elusive backstory.
Hopefully part 1 of this quest will land in your Quest Log at the same time as Part 2 of Magnus' Feeling Frosty questline, so that the Garnet & Opal Rings you make can count toward both quests simultaneously.
As soon as you complete this series of quests, you'll be given the quest entitled In Search of the Jade Owl
Part 1 of 2
Put 1 Garnet Mine into production
Collect 6 Garnets
Make 2 Garnet & Opal Rings
Part 2 of 2
Plant 1 bed of Ice Bells
Harvest 10 Frozen Pollen
Gather 3 fallen Owl Feathers