|This material is published under the OGL|
The blood sword functions as a +2 longsword. [[Summary::On scoring a successful critical hit, the blood sword produces the effects of a vampiric touch spell as cast by a wizard or sorcerer of 5th level in addition to any damage inflicted by the blade.]] The damage inflicted by the vampiric touch is transferred as hit points to the blood sword’s wielder, exactly as per the spell description.
Additionally, any character of non-evil alignment wielding the sword gains one negative level. This negative level is removed as soon as the character drops the blade. Although this effect does not result in actual level loss, the negative level cannot be avoided in any way (including spells such as restoration). There is also no saving throw allowed to avoid this effect.