Two quick attacks that deal disease damage. If one of these attacks misses, the successive ones will miss automatically. If all attacks hit, the target suffers additional disease damage over time.
The above disease damage amounts (115-192[50], 141-235[61], 154-256[67], 179-299[78], 205-342[89]) are with AGI 100 (no worn armor or items, no buffs and no AAs)