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.
The only obstacle they found was a local species of dangerous and very territorial burrowing creatures, the Taigha, which could at any emerge from out of nowhere in the Shasvastii’s subterranean cities or mining facilities with catastrophic consequences. However, the Shasvastii colonists from Jayth soon learned how to fight them and became tunnel warfare experts in the process. This way the colonies, even though separated from the rest of the Continuum, prospered while they waited for the Support and Colonial Liaison Fleet, the Shasvastii race’s security mechanism for all their remote system colonies. Unfortunately, the Jayth system was part of the Norasa Slavers’ route, which fell upon the unprepared colonies like birds of prey. Incapable of repelling a full Norasa fleet, the Jayth Shasvastii were enslaved and many of them carried far away to be sold, both for their exceptional physical qualities and for their special aptitudes for mining in strong gravity environments. 
For more than thirty years they withstood the brutal Norasa regime, until, led by Shivaush—a charismatic rebel leader—the Jaythians rose up in arms, fighting a fierce and bloody guerrilla war within the tunnels and corridors of Jayth’s subterranean cities. For more than fifteen years, these rebels, known as Cutthroats, kept their oppressors in check, until the arrival of the Support and Colonial Liaison Fleet. With the fleet’s help, they managed to bring down the horrible slaver regime. However, after so many years of war, many of those Jaythian Cutthroats only knew killing and fighting, tasks in which they excelled thanks to their hardy constitution and tenacity forged over years in a war against an absolutely merciless enemy.
The naval command of the Support Fleet, impressed by the physical characteristics of the Jaythians, unheard of among the Shasvastii, quickly offered them a place on their ship-boarding and assault teams. The Cutthroats however have not been able to adapt to the discipline of the Shasvastii Expeditionary Forces, and remain as an independent assault team recruited solely among the Jayth miners, used to risking their lives against the Taigha. Either as naval boarding or assault teams, the cutthroats make a distinct unit, one with their own rules and traditions. Their customs and procedures originate from the hard mining environment they come from, such as the “Pit Patrols” with tamed Taighas, as well as from their guerrilla-fighter background and hunting in the dark, like their gruesome custom of finishing off all of their enemies by cutting their throats.
