[Boron]

Chazar had a very good idea imho.

You could make the Hellsword a No-Strength Weapon but 20 Weapondamage.
So you can field it vs. troops but some elite troops (Black Knights e.g.) have a good enough protection to make life draining them difficult.
Vs. other SCs you can forget the lifedrainweapon then with only 20 + 2d6 oe damage.