Unknownreported this bug
Title, the current onAttack aura does not account for skill damage. Additionally, for the onSkillDamage/onAttack auras, the <skill.var.damage-amount> variable does not work, and doesn't retrieve the damage dealt unlike with onDamaged.
There is also no way to retrieve the raw, true damage dealt/received before enemy armor/stats/multipliers. A placeholder like <skill.var.damage-dealt> or <skill.var.damage-true> would be great.