If you know Moonfire you also learn Mooncurse, a ranged spell that is usable while in Cat form. Mooncurse deals arcane damage and applies a debuff to your target that increases bleed damage taken by 10% and can stack up to 3 times.
Ferocious Bite is transformed into Ferocious Bite (Cursed Fangs). Cursed Fangs deals arcane damage, and gives you a stack of Moon’s Blessing for each combo point spent to cast it, with a maximum of 5.
Moon’s Blessing grants your physical attacks an additional 5% arcane damage per stack.