@fresco,
the new hint is "iambic pentameter"
so the riddle looks like this now:
for HE deVOURS the ESSence OF the LIving,
for WHOevER, he SENDS gifts OF hellFIRE,
for HIS foes MUST tremBLE, quaKING in FEAR,
For HE canNOT be BEguiled BY darkNESS,
For HE exPELS unNAMED wraiths TO vanQUISH
So SAYS the LORE... onLY this AND noTHING more.