Poisoning
 

There should be a skill called "Poisoning" that if you have a poison potion(bought in stores or made from alchemy)that you could mark a weapon and use the poison potion on it. Example: "You rub the poison all over the blades edge" and the weapon is now poisoned. There would be 4 or 5 different levels of poison such as...Lesser Poison, Poison, Greater Poison, Deadly Poison, etc. I think that this woud be nice. =P

I like it = )

O.o sounds cool!
I hope it actualy dose something worthwhile though, unlike the poison cloud spell