Mark1733
Explorer
I can't believe I didn't see Assay Spell Resistance - that's excellent, and avoids the main drawback of Spell Vulnerability, namely, the save.
Thanee: that's *absolutely* also on the list. My wizard's a bit of a force obsessive - how does Orb of Force stack up in practice against the other orb spells?
I think another issue on spell choices is that Assay Spell Resistance and True Casting affects the your spells only. However, if you use Spell Vulnerability, and they fail the save, anyone's spells can affect the target and the duration is 1 minute per level. Depending on how many and what other kinds of casters in your party can help with the baddies, this may be worth the chance on the save.