its a normal/superior weapon socketed with a combination of zod-ohm-edias-edmax or shael runes/jewels

a robo matriarchal bow would be 5 edias socket 215% ed/75% ias

a robo warspike would be 4 edias shael zod

a robo ogre maul would be
5 edias zod

etc etc reaching final breakpoints for whichever class they are intended for.