Generally speaking, to set up a godly missile character, you need to beware of the following.

1. Don't invest too much stats points on strength - just invest enough to wear the gear which you want your character to take on.
2. Don't use long-range attack hireling like act 1 and act 3 ones as you need a short-range melee hireling(act 2 or act 4) to compensate your weakness of short-range attack.
3. Don't invest any stats point on energy - saves stats points for dexterity.
4. Don't hold too many strength small charms in your inventory - save spaces for others
5. Don't take any item which requires high strength to wear - about 75 Strength is reasonable.
6. Don't use weapon and rings which have no life and mana leech.

Hope this article can help you in some ways. 

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