One of my PCs is playing an abyssal sorcerer and is wanting a better touch attack to use at higher levels than vampiric touch, calcific touch, corrosive consumption or touch of slime. My idea was a 5-6th level spell that does some better damage than the others like 1d6 per level up to 15-20d6 and another benefit, I was thinking something like negative energy damage or temp negative levels or an effect simularto explosion of rot, toss me some ideas and suggestions as I'm hoping to make something different than the other touch attacks