
Natural 1s |

Hi guys,
I am picking 3rd level spells for my sorcerer and I am planning my build in advance: I want to buy dazing rod later.
Is Ice spears spell forcing saving throws for every spear which is under the creature?
...–creatures that take up more than one square can be hit by multiple spears if the caster is high enough level.Later it suggest that you roll separately for each spear to trip your enemy:
Each additional ice spear beyond the first that strikes a single foe grants a +10 bonus to this CMB check.
It will help a lot with metamagic, because enemies will have bigger chance to be dazed! That spell also deals two types of damage (piercing and cold) and even doesn't care about spell resistance.

Fuzzy-Wuzzy |

You only get to roll once for the trip attempt, but with a very high CMB if the creature was damaged by several spears. They only roll one Reflex save to halve all the damage and stop the single trip.
Even if they were to make multiple saves, though, Dazing Spell affects anyone who takes damage from a spell, not anyone forced to make a save. You'll only get to daze them once no matter how many spears contribute to the damage, sorry.
EDIT: Oh, you mean saves vs daze, not the save vs the spears. Silly me.