I've noticed, particularly on my MagMancer, that some of the abilities make your weapon disappear completely, so:
Caster's Ring - channel your energies through the Caster's Ring - Ring of Shock - Ring of Fire - Ring of Ice - light attacks hit for x damage - heavy attacks hit for xx damage and restore magicka.
With maybe a Gauntlet version for stam abilities. I quite like the idea of a DK lashing that whip from a flaming gauntlet.
Just seems a little jarring when your weap disappears into your armpit when using abilities.