[Vicious Love]

Heh. Great spell idea, if I say so myself.
As for the Thing That Is Not, I came to the same conclusion you did, was dissatisfied with it and, using the power of logical bias, came to a better conclusion. I reasoned that, in IC terms, phantasm is not the same as "aggressive nothingness". One addles the mind, the other addles reality. Also, magic nothing is in many ways unlike ordinary nothing(Which can be easily resisted).
I came to these counterintuitive conclusions because I felt that making high MR offer absolute protection from the Thing will greatly diminish its effectiveness in its principal role: Cosmically unlikely superassassin. As it was never meant to rival the abomination and its ilk in other roles, this would leave the Thing underpowered.
Nonetheless, its attacks do have plenty of resistable side effects, since I simply couldn't disregard magic resistance altogether, when it's so logically appropriate.