Tserrina's Whip
From EZ Server Wiki
This item drops from Tserrina Syl`Tor in Tower of Frozen Shadow. She is spawned by killing "#a shrouded bat" (only the bats with the "#" can spawn her) in the 7th level.
This weapon is particularly nice as it is the only weapon that has type 22 AND type 8, which allows an additional Ninjastrike 8, along with the Ninjastrike 9, 10, or 11.