亡城的守城人
[wáng chéng de shŏu chéng rén]
This could be interpreted as 'The Guardian of the Fallen City'. The term '亡城'(wang cheng), refers to a deserted, ruined city while '守城人'(shou cheng ren) is a guard or protector. It conveys images of someone holding onto something which has passed or become obsolete.