I am not likely to be the top or the bottom of my local food chain. My form may vary. I have foes and friends, but all of them understand the world I live in.
It is not your world.
You cannot know these secrets. I dwell in a stranger land than you can imagine, and my day to day life would be incomprehensible to you. If you see me, it is as a shadow behind your reflection. Of course, unlike the usual use of this trope, I do not dwell in higher, rarified spheres.
I swim beneath.
There is power in this. No matter whether they are gods, kings or paupers, they are blind to the world I am a part of. They cannot intervene, and they cannot watch. I dwell in a stratum separate from theirs, and their castes mean nothing to me. We have our own pecking order, and no matter my place in it, you do not belong.
My weakness is the reverse truth: I have no place in their world and am not part of their order. Whatever my status in my lands, it means nothing above the waters.
But a good bluff can sometimes make a stranger king in a strange land.
If you cannot make yourself understood, it can be enough to make yourself incomprehensible instead. If that doesn’t help, lying boldly can do the trick.
I have even more. This might be a whole THING.