Belia Darzu's dark armor

A suit of dark armor was crafted by Belia Darzu, a Sith Lord who lived centuries before the end of the New Sith Wars. Heavy plated and specialized for battle, the dark armor was worn by Lord Darzu while she operated in a resurgent faction of the dark side-worshipping Sith Order. The suit—like most types of Sith dark armor —was imbued with the power of the dark side of the Force at the hands of its creator. To this end, the armor bestowed enhanced stealth capabilities upon its bearer, as well as increased physical strength. Valued at 37,000 credits, the dark armor was intended for optimal protection against multiple Jedi opponents in battle.

Behind the scenes
The dark armor of Belia Darzu was first mentioned in the The Dark Side Sourcebook, a roleplaying supplement published in 2001 by Wizards of the Coast.