Agree with pbd. This is the Mournland we're talking about, there are stranger things than a tragically trapped figure endlessly fighting undead.
Like the herds of geletanous decadons that roll along, grazing on the unrotting bodies of the dead before moving on for unscrutable reasons, corpses regenerating in their wake. Or the patches where the ground has become living flesh and sprouts hair. Or a literal rain of arrows. Or that barn where the voice of an ordinary farmer (and the accompanying animials) continues to carry out her daily chores in a folksy accent ("Come 'ere now Betsy, time to relieve yer' udders." "Moo."). Or perhaps the dead, untouched remains of friends and comrades past, reflecting the losses of the Last War and the Mourning itself.
The Mournlands is a DM's playground for creating any effect they wish to create. It's a combination of the bizzare, frightening, mad, and loss all mixed up with a whole lot of lethality: it is the Mournlands. It needs no other introduction; or purpose.