Given my experience I wonder if there might be an additional “hidden bonus” [b]temporarily[/b] applied to your RNG each time you get a lootable Dungeon Solo clear in a single session (over and above the permanent bonuses unlocked via the Solo and Solo Flawless Triumphs). I say this as I have a track record of obtaining [b]Heartshadow[/b], [b]Hierarchy of Needs[/b], [b]Navigator[/b] and now [b]Buried Bloodline[/b] each after [u]roughly[/u] five or six lootable Solo clears of their respective Dungeons (with four of five RNG boosting Triumphs unlocked for each Dungeon for completions after the second) [i]without[/i] having done a single grouped completion for any of these Dungeons prior to receiving their Exotics (I did a group run of Master SotW to nab the Catalyst [i]after[/i] getting HoN, for what it’s worth). Obviously a single player’s experience isn’t even remotely the basis to make [b]definitive[/b] statements as to the underlying mechanics of Dungeon Exotic RNG, but in my case it makes for a heck of a coincidence. (΄◉◞౪◟◉｀)

It's just rng. Raid and dungeon exotics are insanely low on the drop rate I mean look at how many people did VoG weekly and never got the exotic till the ability to farm the raid happened. It was common to see people hitting 200+ runs.