Darth Nihl is a Nagai Sith Lord of the One Sith and one of Darth Krayt's senior enforcers in Dark Horse's Star Wars: Legacy (2006–2010). He was a warlord of his own people before Krayt recruited him.
The Nagai are a piece of deep Legends furniture — they were the antagonists of the final stretch of Marvel's original Star Wars run in the mid-1980s — and using one as a Sith Lord a century later is the kind of continuity salvage Dark Horse did well. Filed under the editorial Legacy of the Force bracket because Legacy sits roughly 130 years after the Battle of Yavin. Star Wars Legends.
Catalogue entry. This figure has a verified record here rather than a full write-up — the encyclopedia labels its own depth instead of padding it.