From publisher blurb:
Races of Center Space 5 is the fourth volume in a new series playable races for the 5th Edition rules. Each race in the series is from the Center Space setting. While the Center Space is a science fiction setting, the races can easily be used with other genres.
This volume presents the Siduri — a species of telepathic humanoids who dedicate their lives to the pursuit of reason and logic.
This book contains a racial description and a new racial feat for the Siduri, as well as suggestions for adapting it to other settings.