Katar specially made to inflict lethal damage, it was once used by famous assassin in the past.
It resonates with Ancient Hero's Boots.

For each 2 refine levels, ATK +10.
For each 3 refine levels, increases critical damage by 4%.

Refine Level +7:
Increases physical damage inflicted on Demihuman and Brute monsters by 15%.

Refine Level +9:
Reduces after attack delay by 10%.

Refine Level +11:
Increases physical damage inflicted on Demihuman and Brute monsters by 20%.

When equipped with Ancient Hero's Boots:
Random chance to increase LUK +20 and critical damage +10% for 7 sec when dealing physical attack.