Have collected all of the motes that come from traveler memories, and have killed all overthrow tier 4 bosses, but am stuck on 16 motes not getting that 17th mote to progress for the exotic gun
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I am having this same issue. I even have the triumph for killing every tier 4 boss. I heard that triumph was bugged so I went through and ensured I killed each boss again. In the landing I can confirm I killed the Lucent Hive Wizard, Knight, and Acolyte and their ghosts. In The Blooming I can confirm I killed the taken Ogre, Minotaur, and Chimera. In the Impasse I can confirm I killed the Stasis Subjugator, Strand Subjugator, and Tormenter. After ensuring I have killed each and every boss I am still stuck at 16 motes. And yes I have collected all of the Traveler's Memories and placed them in The Lost City. Any additional information on this or simply having this issue resolved would be fantastic.