No need to flash pre-rooted firmware anymore. Use TWRP for Z5C instead.
I have prepared a pre-rooted 32.0.A.5.32 firmware (based on Nordic Combined, but I don't think the system partition differs).
Unlock your bootloader and use the following one-click solution to flash Zombie b1 kernel (with 32.0.A.5.32 ramdisk) and a pre-rooted system partition. I strongly suggest that you upgrade to stock 32.0.A.5.32 before flashing this, to make sure you get latest BL/modem/etc.
The firmware is not deodexed. I tried to deodex it but couldn't get it to boot.
Help is appreciated, since Xposed doesn't work with odexed roms.
N.B! Only tested on E5823. Will probably not work on other models.