Finding Dragon Strike 20 Mastery Book?

Uh, well I'm sure some people know that some monsters tend to drop more of one certain item than others. Like Bears in Mu Lung drop Cross Earrings, Hectors used to drop Green capes, etc. Now I'm trying to find a [mastery book] Dragon Strike 20 in Khaini and was wondering what would be the BEST monster to hunt at level 130? I've been trying Centipede but getting KS'd pretty bad, others said Red slime, anyone know which monster tends to drop it the most?

SOOOOO happy i got DS 20/30 before the bucwagon C:

You're really crap out of luck cause mastery books are ridiculously hard to come by. Even if you train on a monster for 4-7, 4th job levels you could probably never find one. It's ridiculous. I suppose you could train at a monster with 1.2X drops + 2x drop card, but even then it's not guaranteed. Tend to drop the most is a subjective sight of things, and we can't tell either way cause we don't know the probabilities of each drop coming from each monster.

Best hope is to either train there forever and build up funds for it, go for a different build + save points and eventually just buy it outright.

I have enough money to buy it 3 times, hopefully it'll only need one try. Problem with buying it is it's extremely rare in Khaini, only seen it once and it was sold yesterday. I'm on 24 hour 2x drop, just got it about 20 minutes ago, now I'll be on 4x drop during the event. Trying to hunt centipedes.. =/

I'm in Khaini, and I scan the fm almost everyday and usually see 3-4 DS20 books, haven't been to the fm in like 3 days though. So it isn't that rare, but it is expensive

I'm in Khaini, and I scan the fm almost everyday and usually see 3-4 DS20 books, haven't been to the fm in like 3 days though. So it isn't that rare, but it is expensive

I only found one in the FM in the past two days. =/ And it was sold.