Ok well BP AoEs its just like a Knight build
All you must do is focus on STR and STA untill your Level 28(thats when you get Burst Crack).
Once Level 28 MAX Burst Crack. and focus on going ALL STA!
My suggestion would be go a AoE Ringmaster! 1 reason you will have ALL the buffs in the game and also At Level 80 you will get Merke(thats the only part i know the skills name) ANYWAY it is THE LONGEST RANGE AOE SKILL IN THE GAME! and it last over a period of time! so you can switch from your stick Cast Merk, then switch to you knuckle and shield and use Burst Crack.
Now if you Still plan on going BP then the build is still the same Except Billposters have more AoE skills then Ringmasters. Such as Serpent and some other move.....
Ill Post up a quick Video Useing those AoE moves for you!
Basicly:
Pump Str-(untill 28)
Pump STA(always)
Skills Also Max Prevention! it restores FULL HP when its maxed!
PS: We need a Picture of Atna and her Killing yellow shoes!