Willow's path; The Way of the Wicked - Campaign Journal

[minderp]

Humanoids no, but in 3.5 both undead and constructs are immune to crits (and thus sneak attack) by default - that's a big problem for rogues, especially in good guy campaigns, where undead bosses are common.

Although constructs are immune to just about EVERYTHING else, they aren't immune to crits or sneak. Same with undead, immune to all mind-affecting effects, bleed, death effects, disease, paralysis, poison, sleep effects, and stunning. Immune to any effect that requires a Fortitude save. Not subject to nonlethal damage, ability drain, or energy drain. Immune to damage to its physical ability scores (Constitution, Dexterity, and Strength), as well as to exhaustion and fatigue effects.
But critical and sneak are good! Lucky for Willow.