Hi BlackHawk,
can josi resist hell spikes?
No she cannot. As long as she is in the area of effect, she will suffer damage from this spell. Having this spell at level 3 is nice. Of course, it wouldn't hurt if you had that spell at level 5. It's one of the most powerful spells in the game because it can't be resisted by any monster, does a lot of damage, and is also an area effect spell.
Thanks.