The Storni glass prowler was a crystalline insect from Storinal. It was harmless, and often kept as a pet. Ton Phanan had one which he stole while on a mission to Storinal. Eurrsk Thri'ag, also known as Grinder, also stole one, hoping to use it as a prank. After Phanan's death, his glass prowlers were passed on to his friend Garik Loran, who continued to take care of them.