damage from skill can't be used with damageMods

testdamage:
  Skills:
  - damage{a="100";ia=true;ie=true;pkb=true;pi=true;dc=ENTITY_ATTACK} @Target

testblock1:  
  Skills:
  - onDamaged{auraName=blocking;d=50;damageMods="SKILL 0.5";oH=blocked} @Self

testblock2:  
  Skills:
  - onDamaged{auraName=blocking;d=50;damageMods="ENTITY_ATTACK 0.5";oH=blocked} @Self

blocked:
  Skills:
  - message{m="<skill.var.damage-type>"} @Self

I tried both testblock1 and testblock2 to myself, and then deal damage to myself by making a mob cast "testdamage". and neither of these auras help me reducing damage to 50% how do i reduce dmg that i received from a skill? I checked and <skill.var.damage-type> always return "SKILL" and it doesn't work with damageMods