http://www.nexusmods.com/morrowind/mods/44061/?

Remember Ra'virr's bound weapons- the Fiend, Devil, and Demon weapons? Well this expands what Ra'virr sells- adding a new dagger, as well as other bound weapons. These weapons are a bit more expensive than what Ra'virr sells in vanilla... And are a bit more interesting in how they function.

They function almost identically to the vanilla/default bound weapons, only they are cast on strike, last for 20 seconds, and have a weakness related to drained restoration/personality/sun damage during the 20 second period of the weapon being bound as a balancing factor... And to you know, make the weapons have that extra Unholy feel to them. And of course unlike vanilla, Ra'virr now sells bound swords, axes, spears, maces and stuff

The "Unholy" weapons, are all cast on strike, the one handed Unholy weapons will automatically bound a shield, and to balance this all out... The effect only lasts for 20 seconds, Personality is drained by 50, Restoration is drained by 100, and you take 20 Sun Damage per second for those 20 seconds. That is the balancing factor... These weapons aren't meant to be super-uber, just intended to be interesting to use, and to make Ra'virr's inventory more diverse.

Some time ago, I really liked my bound dagger/bound shield, cast on strike enchantment, which balance wise really doesn't seem that far beyond the Bound weapons that already exist- especially when adding in a weakness like the one described above.