A new box set coming out for Infinity later this month, the Jayth Cutthroats are a new set for the Shasvastii. You can get a closer look at this trio of warriors in this preview article.
From the article:
The planets in Jayth’s system are characterized by their strong gravity and mineral wealth. So, following the standard Shasvastii colonial protocol, the Shasvastii expedition that arrived there adapted their physiology to the environment, making themselves sturdier and bulkier, and established a series of small mining colonies on the main planet, Jayth-1.