Axe: 1d6 dawizard.
They are. Spears and such are also pretty good at this sort of thing - speaking as someone who does some amount of armed sparring, if I have to fight multiple people I want a polearm of some sort to do it with, favoring a spear. If I'm stuck with a short weapon, I'd rather have a shield than a knife in my other hand. The horde-slaying items are honestly rather terrible for fighting hordes.