You know, all this has me thinking. Yes, the Overlord is pretty nasty, bu the pinnacle of evolution for slivers? Not in my eyes. Enter the pcs, brand new to the planes. They encounter a few slivers her and a few slivers there and the occasional half sliver. But, where do these baddies
truly come from? Why the plane of slivers of course. Enter a new template and a new kind of sliver: The Slivered [Creature] (template) and the Planar Sliver, a creature that collects the dead bodies of slivers and adds them to its immesive size: the size of an entire plane! Now (to me anyway) it all makes sense. Where do new slivers come from? From the Planar sliver of course, which are spawns of it. The Overlord is just the protector of it. This makes it nigh impossible to defeat slivers once and for all.