"To end it, I will gift to you my light. Though in so doing, I condemn myself to sorrow greater still."

The mysterious voice does give a hint, if a somewhat obscure one. Luckily, Cecil is here to translate.

"On that day, the powers I held as a dark knight were dispelled, replaced by those of a paladin. You'll now go through that in my place, I imagine. However, I still had to prove myself worthy of them... or die, and his hopes along with me."

As if to confirm those words, the voice continues.

"But the hour is late. No other road remains."