Introduced with The Dark Below, the event is currently missing in Patrol missions.
Bungie recently updated Destiny with a hefty patch, weighing in at roughly 4.3 GB or so for current gen users. While the new options have been greatly appreciated, there seem to have been some unfortunate side-effects – like the removal of the Blades of Crota.
After The Dark Below launched, a new event of sorts was added to Patrol missions wherein a Hive Knight wielding the Sword of Crota would be available to murder. Killing the Knight would allow you to use the Sword and wreck havoc. Along with offering sword practice for the Crota’s End raid, it could also help users in completing bounties from Eris Morn, the new NPC introduced with The Dark Below.
However, Reddit users are now reporting a complete lack of Blades in maps like the Cosmodrome. You can still find a Blade of Crota in the Fist of Crota mission in The Dark Below. The problem is players who don’t own the expansion will miss out on fighting these enemies on Patrol missions and completing Eris’s bounties without necessarily buying the expansion.
Whether it’s a glitch or not remains to be seen so stay tuned for more information.