The function of the Fox Fire as a race-exclusive privilege was to give the foxes a boost in their overall power.
Fox Fire wasn't like the Red Fire which turned its users berserk or Rejuvenation Fire which did nothing but heal and restore.
Fox Fire boosted the abilities of all the foxes near its burning presence. Fox Fire wasn't hot, but the foxes could feel the warmth.
They were drawn to the warmth the same way a child was drawn to a mother's embrace. The glow and metaphysical heat produced by the Fox Fire awakened a distant primal feeling within the foxes, making them feel as though they could only be at home in a place where the Fox Fire burned.
With the Fox Fire, Ivana had no problem taking over the role of caste leader from Vixy. Everyone knew that when Ivana grew older and her ambitions started to rise, which was expected for a fox, she would more or less take the caste leader role.
