Besides being hypnotic ruthless evil space worms, Sathar are also bio-cyber-engineers.
Which in game speak means they take critters and warp them into monsters by attaching weapons and control devices.
There are some cool ones already in Star Frontiers - the Quickdeath (think of a tentacled tiger), laser-firing slugs, dinosaur-like critters with head-mounted energy weapons, slave troopers, etc.
But some fantasy monsters scream out to be SAMs. Here are my top four.
1) The Purple Worm. Add an in-mouth gas expulsion system, a battery pack to power eye beams, and maybe attach an albedo screen to it? It's a natural.
2) The Bulette. It's basically already a SAM, except for some reason it doesn't reflect lasers or shoot death rays. Both are easily added.
3) Type III Demons. The Sathar took these poor peaceful creatures and hacked off their hands and added big C-clamp bladed grabbers. They probably made them bullet-resistant, too.
4) Grell. Tentacles beaked brain-looking things that eat people. Add a sonic stunner area attack with pulsating rings in the illustrations and bam! Sathar Attack Monster.
The LJN one with the eyes would have hypno-rays, maybe.
I'm leaving off the Beholder, because those are clearly Dungeon Master Attack Monsters. Even the Sathar wouldn't know what to add to them.
I should mention that one of the inspirations for the Slorn (the big breath weapon lizards in my DF game) were SAMs.
Any other fantasy monsters that are clearly Sathar Attack Monsters?