You need the enchantment to 100 with full enchanter and 2 enchantment perk.
And the enchantments you need is:
Fire Damage
and any destruction type enchantment, i recommend you the notched pick's enchantment, combine it and it seem to be deadly to your hardest foes.

"For inf. enchant charges: you need zero magicka cost armour set to "null" the charge (which makes it stop unincrement)"