SafireDeluge
First Post
If a Rogue takes the Wintertouched and Lasting Frost feats, which respectively causes a creature with vulnerability to cold to grant combat advantage and the other gives a creature vulnerability to cold with any power using the cold keyword, could they activate the Lasting Frost feat to give an enemy vulnerability to cold by using the At-Will power on a Frost Weapon which changes all damage to cold damage (containing the cold keyword) and infinitely have combat advantage?