You have learned the deadly art of poison delivery, and can guage, roughly, how effective such an attack will be.
Benefit: You never poison yourself when applying poison to a weapon. You may also attempt to read, roughly a target's Fortitude save against poison by spending a full-round action in observation within 30 ft. of your target. Every 5 ranks you have in a single Knowledge skill relevant to your target (for instance, Knowledge (dungeonerring) against aberrations) adds 30 ft. to this range. The possible results are on the following table.
|Target's Fortitude save bonus against poison||Your Reading|
|+3 or less||Weak|
|+4 to +9||Healthy|
|+10 to +15||Moderately strong|
|+16 to +21||Strong|
|+22 or higher||Practically immune|