Heat olive oil in a large pot over medium-high heat. Add onion and ½ teaspoon salt, sauté until softened, about 3 minutes.
Add chili powder and 5-spice powder and sauté for 1 minute. Add celery root, sauté for another minute.
Add broth, and bring to boil. Reduce to simmer, cover, and cook until celery root is tender, about 10 to 15 minutes.
Puree soup in batches in a blender. Transfer back to pot and stir in coconut milk beverage, remaining salt, and pepper. Add more salt to taste (depends largely on how much salt is in the broth you use.)
Recipe by Go Dairy Free at https://www.godairyfree.org/recipes/dairy-free-cream-of-celery-root-soup