Delta does not believe this cloaked figure to be an illusion, but after careful consideration, believes it may not be entirely nature either, perhaps a member of the fey, or a ghost, or a creation.
The red cloaked reference does not set off any special warnings. The plans discovered recently mentioned a blood cult, maybe they wear red, maybe not. Other groups certainly do, its a common color.
What Tanyl smells at the top of the grate wafting up from below reminds him of the Troglodytes and does nothing to improve his appetite.