Talk:High Wraith/@comment-2A02:C7D:9E65:E300:3CBF:81B0:AF85:44E4-20171008225604/@comment-26955555-20180331163504

Anon, I believe it was High Wraiths

"The tension in the atmosphere thickened. Suddenly, the sounds of resentment stopped. The noises emitted from the monster mixed together, forming one sound different to the intelligible cursing earlier."

^ this is a qoute from Vol.4, ch.1 part 1.

Wraiths are described as a single ghost, so it's most likely that they were High Wraiths.