The Trell

Seventh Nameless One in the Ritual of Release: 'Barghast, Trell, Tartheno Toblakai...these are the surviving threads of Imass blood, no matter their claims to purity. Such claims are inventions, yet inventions have a purpose. They assert distinction, they redirect the path walked before, and the path to come. They shape the emblems upon the standards in every war, and so give justification to slaughter. Their purpose, therefore, is to assert convenient lies.' (BH, Prologue)

'Trell were plains-dwellers.' (DG, UK MMPB, p.107)

Mappo:'...my homeland, on the other side of the Jhag Odhan.'(DG, UK MMPB, p.173)

'Short and wide as a siege engine, his skin a deep, warm brown, his black hair braided and studded with fetishes. If anything, his canines were bigger than his companion's (Icarium), and looking much sharper. A Trell.' (DG, UK MMPB, p.302)

'Trell are quite literate...Have been for some time. Seven, eight centuries, in fact.' (DG, UK MMPB, p.145)

Trell origins

.  The demons – Venath, who'd once been allies of the Jaghut.  Who gave of their blood to the Trell – and what a fell mix that turned out to be (DoD) 

Mappo's people

'two centuries past...He'd known centuries already, wedded to war in what had become an ever-repeating cycle of raids, feuding and bloody sacrifices before the god of honour...He had been young when he walked out of the trader town that was his home. He was caught - like so many of his age back then - in a fevered backlash, rejecting the rotting immobility of the Trell towns and the elder warriors who'd become merchants trading in bhederin, goats and sheep, and now relived their fighting paths in the countless taverns and bars. He embraced the wandering ways of old, willingly suffered initiation into one of the back-land clans that had retained the traditional lifestyle.'(DG, UK MMPB, p.292-3)

Mappo seems to have a kind of darkvision, neither he or Icarium having 'much need for artificial light, the darkness...offering no obstacle.' (DG, UK MMPB, p.172) Whether or not this is a racial trait is a separate question, though it seems likely to be.

Nom Kala found the Bonecaster, Ulag Togtil, at her side.  He was, without question, the biggest warrior among the Imass she had ever seen.  Trell blood.  She wondered what he had looked like in the flesh.  Frightening, no doubt, broad-mouthed and tusked, his eyes small as an ice boar's.  She had few memories of Trell – they were all but gone in her time, among the first to be driven from the face of the earth by the humans. (DoD)