Willbenders'trinket drops not in Echovald but in Old Kaineng, Aetherblade camp, very easy.
Today i got the badge of the willbender. I made the event "Escort Aimi and her team deeper into the ruins is a level 80 event in Old Kaineng." before. Then i was hanging around southeast of the Vista , south of the Aetherblade camp. There is a little platform with "Field notes 3" on it . There spawned a purist champ, i think it was Mal-Chin.
I announced it into the map chat and a squad arrived very quick. " Nice call" they remarked.
I hope i can help you. If the events at Lutgardis Market are necessary i don't know.
One of several Purist Lieutenants will spawn in Old Kaineng during https://wiki.guildwars2.com/images/b/b1/Event_boss_%28tango_icon%29.png [Group Event] Defeat the Purist champion. (80) following completion of the Thwart the Purist agitators! event, which takes place in Lutgardis Market. Spawn locations are varied.
Champion Akma
Champion Gakkai
Champion Mal-Chin
Champion Mun-Hee
Champion Sarin
Champion Sonsang
Jo kitten
Ryeo