Ace had a mission on Titan I think it was which was removed so the quest can't be completed and the Ace now must be purchased in the Kiosk same goes for any weapon that was apart of a planet that got removed which funny enough is mostly Titan
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Bungie had no need to do that it wood have ben better to just change what planet the mission was on just like it wood have ben better to change what planet the data pad was on in the out brake Quist bungie volt all it was able to volt in 1 go if it needed to or not and the story about y bungie volted content change a little even time a different dev told it the latst version is bungie do not want to have players need to make space for d2 updates the story b4 that was bungie had lots of new content to add in buond light the TRUE story is bungie wants to control what we play a lot of people do not like the newer content and so bungie had more people playing forsaken then buond light the first session of buond light was good but the rest of the dlc has ben bad d1 content with changes to make it harder is not new content