Fire Mastery is the string and glue that holds the Fire SpellsSkill Tree together. Without it, many of the Sorceress' Fire Spells could not reach their full potentials. For each skill point invested, a huge amount of additional Fire damage is added to all Fire Spells that meet-out damage.
Tips[]
Maxing this skill is recommened if you are a Fire-based Sorceress. It will help out your damage more than you could know (unless you've been down this road before).
Lore[]
Even for the Sorceress, the destructive powers of the flame can prove uncooperative at times. The very unpredictability of elemental flame poses a danger to those unskilled in its usage. Sisters of the flame must take this last step to complete their training in the use of fire, and to maximize its effects.[1]
References[]
↑Diablo II Manual, page 87. Blizzard Entertainment, 2000.