one of my favorite things since skyrim has been bound weapons, they weren't overly effective late game but were cool as hell. I'd love to see a bound weapon skill line added someday to ESO. So along with that desire I've come up with a few ideas I think are pretty cool.
In my concept you would of course be barehanded, no weapon or shield needed, perhaps there would be a passive that adds to your weapon/spell damage and armor when barehanded. light/heavy attacks would summon a weapon on swing that would perhaps vary based on distance from your target, from dagger to greatsword to bow, blocking would of course summon a shield.
each active ability could represent a different weapon as well, which the ability would summon and use when activated, such as a snipe ability that would summon a bow, or a crit charge like ability that would summon a greatsword/axe/etc. really it doesn't matter as skill animations have little to do with what weapon you have equipped as is.
this is all off the top of my head, feel free to add your own suggestions or just rip on the idea lol.