so, she
-summons yetis
-heals
-silences the demigods that are close to her for a brief moment
-can be really really fast (some of her passive skills boost her speed)
-fight with a spear (she doesn't trow it, just slash through the villains with it)
-has a regen aura
-can order her cat to bounce on her ennemy, it is pretty fast and interrupt spells, so it is pretty usefull, even if it doesn't do a lot of damages
it dont think there is a sedna video, but the devs will probably do one soon. Anyway, she is pretty fun to play, even if she is more a support character than a real fighter, she can still be dangerous if well played.