[Spell]Necromancer Dmg&Powerdrain spell

1)Necro Powerdrain spell is missing description,
2)Powerdrain give user only like 5% of drained power, it should give 50% of damage done to target.

Source: http://web.archive.org/web/20031019092507/http://www.camelotherald.com:80/spells/line.php?line=6010