She is not shaman, "Tuonetar" was the who did keep the dead and everyone who did enter in her world in. Many humans did go there to get her magic and wisdom. She was evil and did usually offer a golden goblet of beer as a "gift" but really did poison all who did drink it. She did have really evil and sneaky ways a killing peoples.
My character is normal human who have gone crazy. She likes death and usually count every kill and mark it in her weapon as a trophy. She "hunts" in the dark and she thinks she will be come the next "Tuonetar".
There is coming next concept where she uses her dark "magic" etc ^-^
I haven't yet find what symbols Tuonetar did have or how people did write her name, so I might just use the underworld mark