The Icthal were humanoid aliens with grey skin.
Biology
The Icthal had broad faces with all the features bunched up in the middle. They had fish eyes and gill-like ears. (PROSE: To the Slaughter)
History
The Icthal once wished to purchase a weapon from Robart Falsh's Weapons Research Institute on Carme to protect their space from human expansion. (PROSE: To the Slaughter)