For arch bishop leveling i have tried 2 ways till now and both worked great
1. Turn Undead
2. Magnus Exorcismus.
for using Turn undead you can try abeey level 2 and spinx 4
you will need decent amount of int luck and dex to kill them in one shot with turn undead.
for Magnus Exorcismus build u will need high int and dex.
you can try mobing in abeey any level will depend on if you have help or not but if are in a plan to solo then i will suggest go to abeey level 3 for necromancers.
just Magnus Exorcismus them and Teleport using a flywing they will die in your Magnus Exorcismus evently.
the best equips if you ask me for this build will be
divine cross, spiritual ring, and clip or rosary with a Beelzebub card
this give 30% more damage with Magnus Exorcismus
I prefer this equip set even while leveling as a acolyte as it give 50% more damage form heal skill
For leveling from a acolyte refer this link also