I just completed this quest for it and nothing...no marks no black spindle???
-
Black Spindle is not a Quest. Did you go to the Lost to Light mission on the Moon hardmode kill the Ogre get the shard run from the Taken unlock the two doors with the runes without dying on the third room make your way past all the wirerifle shooters enter Taniks Ketch ship clear the ship out before the timer expires. If you did all of the above check the post master.