Even after getting Umbral Enhancement III ("Weapons obtained from Focused Umbral Engrams drop with an additional alternate final perk. Armor obtained from Focused Umbral Engrams has a chance to drop with a higher stat value."), Cold Denial pulse rifles I get from Arrival-focused or Pyramid-focused umbral engrams don't drop with an alternate final perk. I haven't gotten a falling guillotine yet to see if it's also affected (since it's the other season pass weapon) but will update if I do. So far, other pyramid weapons seem to be working properly. (I got a pyramid bow that had two final perks as umbral enhancement III describes) Also, before anyone asks: yes, I did wait to focus these engrams until after I'd unlocked umbral enhancement III. I didn't focus them, then unlock the perk, and expect it to work retroactively. EDIT: Just got a Falling Guillotine out of a pyramid-focused umbral engram and it does not have an alternate final perk. EDIT2: Can confirm that all other guns that come out of the pryamid-focused engrams (Whispering Slab bow, Hollow Words auto rifle, False Promises fusion rifle, and Temptation's Hook sword) are getting their alternate final perk as described by umbral enhancement III. So it really does seem to just be an issue with the season pass legendaries.