Pretender assassin - balance?

[Murph]

I'm still tinkering with the idea of a Pretender assassin for the Malazan Empire mod I'm (slowly) working on. I can't see that an assassin pretender would be over-powerful, but a huge-sized assassin is a bit silly, IMO. If a Titan wants you dead, he kicks over your house and lights it on fire with lightning, he doesn't find 2 really tall buildings to hide between and then drop a chimney on you when you walk past.

Besides, it comes down to utility. A huge combat beast doesn't need to be an assassin, likewise a killer mage. But a sneaky assassin pretender would be a pain to get rid of, and surgical strikes would be easy, plus even a well-defended mage or commander would have some serious problems when a pretender swings in the window. So, stealthy preacher, almost uncatchable pretender and assassin? I don't know about anybody else, but I could find some use for that.