The Turs Andayr feat
You have studied the dangerous art of the Crimson Dance, the knife-wielding combat style of the Minbari.
Prerequisite: 4+ ranks in Perform (dance), BAB 1+, Minbari (or Games Master's approval)
Benefit: When armed with a Minbari fighting knife in each hand, you may take a full attack action to strike the blades together during a single attack. This limits you to one attack this round and inflicts a penalty of -2 to hit, but a successful melee attack inflicts +3 damage and forces the target to make a Will Save (DC equals 10 + your ranks in Perform) or suffer a -1 circumstance penalty to attack and damage rolls for the next 2 rounds.
This penalty is cumulative, but only if it comes from other attackers with the Turs Andayr feat. The penalty is sonic-based and a target with any form of protection from sonic attack is immune to the effect (but not the additional damage).
The danger in using the Dance of Crimson comes in the possiblity of injuring yourself with its close-body manoeuvres. If the Turs Andayr special attack misses, you take your Strength bonus in slashing damage (minimum of one point) and must make the same save as listed above. If you fail, you suffer the same -1 penalty and may not attack using this feat until its detrimental effect ends.