I felt that the skill with Charged Bolts was the only decent elemental attack for a Spearazon. Fend acts like Zeal, so if you miss once you would miss all attacks IIRC. Spears also have Strength and Dexterity requirements, but they are not too high for Normal difficulty. One thing you can do to get good spears would be to gamble for them. You may get an Amazon spear from Anya in Act 5, but it's random on what Amazon weapon you get.