The [url=https://www.bungie.net/7_Bungie-Weekly-Update---08202015/en/News/News?aid=13414]August 20th Weekly Update[/url] said
[quote]How can I earn Legendary Marks?
By completing Daily Story Chapters, Weekly Heroic Strikes, and Daily PVP Activities[/quote]
That answer omits the current House of Wolves activities:
* normal Strikes (2 to 6 Vanguard Marks per Strike)
* Public Events (4 Vanguard Marks per Gold Tier completion) and Public Event Packages (2 Vanguard Marks per day)
* Level 28 Prison of Elders
Can we earn Legendary Marks from the above activities in The Taken King? Or are those sources of PvE Marks gone in TTK? Or something else? :-)
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Honestly we'll probably still get marks from running the playlists and Public Events, it would be weird not to; plus the activities they mentioned only give out marks once per day/week so it would ruin the unlimited gain thing. As for PoE it isn't a Vanguard/Crucible activity so it makes sense we don't get marks from those.