In the Tales of Tribute card game in ESO (Elder Scrolls Online), you need to upgrade certain cards with card clues. Tales of Tribute launched with the High Isle Chapter and is one of the main features of the update.
Card Clues drop from Tribute reward boxes, you can get clues even if you don't have certain patrons. Once you have a clue in your inventory, you can find all the locations of the clues by checking the Tales of Tribute overview page.
Card Upgrade Clues
Ansei's Victory Clue (Alik'r Desert, West of HoonDing's Watch.)
Blackfeather Knave Clue (Stonefalls, Crow's Wood. In the ruined building.)
Blood Sacrifice Clue (The Rift, near the tents.)
Ceporah's Insight Clue (Coldharbour, The Wailing Maw)
Grand Larceny Clue (Grahtwood, in a tunnel of ice.)
Grand Oratory Clue (Stros M'Kai, near Pillar of the Sing Sun.)
Hagraven Matron Clue (Wrothgar, under an old tree.)
Hlaalu Councilor Clue (Deshaan, upon a ledge.)
House Embassy Clue (Vvardenfell, Balmora)
Knight Commander Clue (High Isle, near a ladder on roadside.)
Knights of Saint Pelin Clue (Bangkorai, under blue flame brazier.)
Legion's Arrival Clue (Bangkorai)
Murder of Crows Clue (Glenumbra, near the fallen tree.)
Psijic Relicmaster Clue (Auridon, Wansalen)
Ring's Guile Clue (Reaper's March, under a brazier.)
Serpentguard Rider Clue (Greenshade, under a tree.)
Summerset Sacking Clue (Auridon, under stone arch.)
Druid King Vestments Clue (Galen)
Wispheart Totem Clue (Rivenspire, at Agea Relle's door)
