new skill   SectorAttack   
 - SectorAttack;distance-10-10/Mob;15;2;10
The mob faces the fan-shaped area with the midpoint line.
This part means:  SectorAttack;the entites within 10 meters of the mob ,limit amount 10,and the only type affected is ’Mob‘ ;The Angle of the left and right sides of the sector is 15,radius is 2, damage is 10
Target chooser    :
if you want independent target chooser with one skill, you can write a list in skill line:
ex:
 - Lightning;distance-10-5/Players,Mob,Camp:NPC
Summon lightning to radius 10&midpoint is mob's circle,to 5 Player/Mob/Camp is NPC's mob 's positions