From the Ground Up (Age of Calamity)
The quest is unlocked after completing The Master Kohga Chronicles! quest.
"As thanks for their invaluable advice on rebuilding the Yiga Clan hideout, a Yiga footsoldier wants to give the Sheikah scientists something special from the clan's loot stash."
"The donation from the generous Yiga led to a major step forward in the scientists' research! From then on, an unlikely bond developed between the Sheikah researches and the Yiga Clan."