Arohongui, Moon's Presence - Totem immune to fire usage

Hi,

I look at "Arohongui, Moon's Presence" and can't help but notice the effect "Totem are immune to Fire Damage". I am wondering why? Is there a professional player know how to use this effect? So far, what I can think of in practical is RF spell totem. Can you suggest something else?

Thanks!

They are immune to all fire damage, not just their own its pretty big to be completely immune to a damage type some bosses only do one.

It isn't supposed to be a hugely important modifier though that is the others, its like a nice piece of circumstantially useful flavour.