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This summons a Fire Charm. These orbit your head like a Monk's Spirit Sphere. You may have up to 10 fire charms up at once. If you have 10 fire charms, your weapon will be endowed with Fire Element. Summoning charms of any other element will remove all charms.

Fire Charms increase damage inflicted with fire element ninja skills:
Flaming Petals: +20% per charm (+200% with 10 charms)
Blaze Shield: +5% per charm (+50% with 10 charms)
Exploding Dragon: +15% per charm (+150% with 10 charms)

이게 얼추 맞는듯요 닌자는 따로 패치햇던기억 안나니 

닌자스킬들을 보면 대부분 마공이나 물공 +적용이라 좀 거지같아요