GitLab

Using

  - skill{s=[
    - skill:passive_hit_combo{} @EIC{r=5;a=90}
    - skill:hit{} @EIC{r=5;a=90}
    - sound{s=entity.player.attack.sweep;p=0.3} @self
    ];cooldown=0.3;sync=true} ~onSwing

passive_hit_combo:
  Conditions:
  - targets{a=>0} true
  Skills:
  - onAttack{
    auraName=passive_hit_combo;m=1+2*<skill.var.aura-stacks>/100;
    d=20;ms=10;
    onHit=[
      - particles{p=damage_indicator;a=floor(<skill.var.aura-stacks>/2);vS=0.2;hS=0.2} @targetlocation{maxdistance=2}
      ];
    onStart=[
      - message{m="<skill.var.aura-stacks> hit combo"} @self
      ];
    onEnd=[
      - message{m="combo ended <skill.var.aura-stacks>"} @self
      ];
    } @self

The particles wont appear if you aim next to the mob and hit the entity with the Hit{} EIC mechanic