Wolves of the Maelstrom
For Midnight they looked like insects that speak only in howls and who can and go impossibly. They hated Midnight’s music which causes them pain and might be able to destroy them. They thoroughly infiltrated the White Guard but Midnight was able to drive the wolves from several of them. Commander Kriss however escaped.
For Hiccup they resemble angels with empty holes for eyes. They continue to come and go impossibly.
Now two have died. Kriss and Switchblade.