Can't tell if that's a typo or something really cool I've yet to try. According to the calc, at level 29 it costs -1 mana and continues to decrease by 1 for each additional point.
I tend to max spear first, since it's my favorite of the two attack spells, and then I do round-robin with wall/prison/spirit for the rest of the game really.But I tend to be stuck playing solo a lot, and don't use the marrow bug so it makes sense for me to invest so heavily in the monster containment area.
Well, I checked the game files and the minimal mana cost is 1, so it shouldn't go below that.
Nice tag btw
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Diablo III Analyst
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