Iíve only seen them on gambler Ed at the end of Immortalís Respite on madness. Seems pretty op and since ferryman isnít fought on the boss wave and ferryman was a fairly recent addition, it seems to indicate these will be added in the future for players to use. Let the speculation ensue.
https://share.icloud.com/photos/0JzX...qd1T1lgFF1RMGA