|Spell level :||Innate level: 2, Warlock: Least|
|Descriptor(s) :||Eldritch essence|
|Save :||Will negates|
|Spell resistance :||Yes|
In addition to normal eldritch blast damage, the frightful blast forces any creature struck to make a Will save or become shaken for 10 rounds, taking a -2 penalty to attack rolls, saving throws, and ability checks. Creatures with more than 6 HD are immune to the fear effect.
Obsidian probably does not realize that the penalties are already hard-coded into the EffectFrightened() effect on the engine side, so the re-apply the penalties through scripting, resulting in double penalties being applied. Many Fear spells and spell-like abilities suffer from this bug. The actual penalties applied are: -2 penalty to damage, attack and all saves hard-coded into the engine plus the weird penalties applied through scripting: -2 to saves vs. mind-affecting spells and an additional -2 penalty to damage and attack, resulting in an overall penalty of -4 for mind-affecting saves, -2 for all other saves, -4 to damage and -4 to attack.
In addition, targets immune to fear who fail their saving throws will still suffer the penalty applied through scripting, resulting in -2 penalty to saves against mind-affecting spells, -2 to damage and attack, which obviously shouldn't happen if target is immune to fear.
There is no "ability check" penalty, likely because Ability Checks are rarely used in NWN 2. Other spells which inflict a "shaken" effect seem to have the same save and ability check inconsistancies.