Need help for LOB RTD quest

The secret history of the Emei

( 1 ) Four-Armed Demon's Blood
( 2 ) Axehead Demon's Blood

I already got Four-Armed Demon's Blood But when I kill Axehead demon ( lvl 68 ,
The place where the snake coiled lady boss spawn )that mobs never drop blood bottle.
Any idea or any one know how do I find or where do i get Axehead Demon's
blood?
Pls tell me the mobs location.
Thanks in advance!

He is a particular Axehead Demon you have to kill, but I have forgotten his name, he is located in Jinan 910:280

He should be close to 'Dark Falchion, Four-Armed Demon' which was suppose to be the Mob to kill for Four-Armed Demon's Blood.