Doubles critical hit threat range.
Adds Holy or Unholy properties to your weapon, bypassing damage reduction on evil enemies.
Your primary Spell Strike option. It gains a +3 bonus to attack rolls if the enemy is wearing metal armor.
Estoc . It is Finesse-able, has 18-20 crit, and you can craft/buy excellent Estocs mid-to-late game.
Turn on Fighting Defensively and ensure Spell Combat is toggled active on your action bar.