Spear of Purity Spell Question

[Heathwool]

I was reading through this and had questions about a few things:
Do the enemy always get a Save, or is it just Evil Outsiders on the d6 rolls? And if used against a neutral creature, what dice do you roll for half (furthermore, do they get a save for an additional half)?

[Weirdo]

Everyone gets a save.

A neutral creature gets half the evil creature dice (half of d8 per 2 levels).