My Level 1 Halfling Wizard, your thoughts?

[Yvian]

btw. does improved critical(rays) only work with dmg spells or with ability drain/damage aswell?

I will have to check the FAQ, but I think it works only with damage spells.

Critical hits and sneak damage only work if you do physical [hp] damage, per RAW.

With ability drain/damage, there is nothing to multiple. Sigh.