where to put rest of meteorb sorc skil pts

[blinky]

so by 87 ill have 20 skill points or so, i got tals set, 20 orb,fb,metor, 5 fire mastery, i can kill pretty quick in 8 player games in the pits and anywhere else fb takes down prety quick the -15 % fire res realy shines max fire mastery prety much doubls FB from 2.5 k or so to 4k or so .how much more dmg will that add to FB with the-15% included. vs maxing ice bolt to add maybey 140 dmg to orb to bout 520 with the+15% dmg or should i put enough points into cold mastery to get -100% dont plan on doing meph maybey baal will geting CM to -100% do double dmg to monsters in the pits?

[Superhal]

max out fire mastery, max 7-17 in cold mastery.

[melianor]

The increase in damage depends alot on the fire resistances of the mobs. It will be a nice increase in damage, but certainly not 15% ;)

Like Superhal i would suggest to max out FM and dum the rest of the points into CM.