The Hero (novel)
 The Hero is a novel by John Ringo and Michael Z. Williamson and is partof the Legacy of the Aldenata series. It is set in the future after the defeat of the Posleen and features a Darhel named Tirdal who is the first of his race to be assigned to a military team. The Darhel have a genetically programmed limitation - they cannot kill or they descend into lintatai a type of madness followed by catatonia and death.