how do i get thorn catalyst? are there any requirements?

[silk umbra]

.

[fluid owl]

random drop from playlist activities, i got mine from nightfalls. GL!

[soft musk]

Nightfalls, playlist striks, crucible and gambit

[zealous helm]

some catalysts don't drop from playlist activities, like dungeon exotic catalysts (if the exotic has one) will usually come from clearing the master version of the dungeon or a quest inside the dungeon