But perhaps a priest of Slurm the warrior slug is in order.

To be perfectly honest, I've never had a good grasp of the IC relationship between mortals and Imms, which is why I suspect my empowerment attempts generally feel so bleh. This could just be my issue, but I can't think of a single character I've played that would have legitimate (not based on belief/faith) reason to fear any god, let alone a newly made one.

I fear a "mortal" lich because they can kill me, will kill me, and few things and few people are going to do a whole lot to stop them. An Immortal isn't that level of scary to your ordinary non-empowered PC char. They are like the POTUS or a Senator or something. Sure, they could make your life miserable if they wanted, but chances are they aren't going to bother and if they did, someone else (rival Senator) might step up and smack them back. And at the end of the day I can vote them all out of office.