Also, following on from Burbin and RogueLeader’s excellent work, here’s my reworking to maintain the ABAB rhyme scheme and iambic pentameter Burbin’s inscription implied:
It whispers only to a darkened heart
Revealing where the Sith Wayfinder dwells
Embrace your anger, let your hate take part
To those it chooses, only this blade tells.
I like the iambic pentameter, because Shakespeare used it to denote either speeches of key importance and/or members of the nobility speaking, which is definitely how I imagine the Sith would see themselves.