Common advice about actions of all types. Remember that each encounter is a new opportunity to role-play and create moments you will remember. Measures of Activity determines how many and what types of actions it takes to accomplish a task.

d20™ Action Mechanics

This content is part of the i20™ Variant for the d20 System™.

Open Actions

When performing certain types of activity, if it can be accomplished using any of the character’s Action, Bonus Action or Reaction, it is referred to as an “Open Action” activity. Few things rely on Open Actions.

Measures of Activity Use

The standard hierarchy of d20 activity is Action > Bonus Action > Reaction. Some circumstances rely on multiple measures of activity; If they required Action Type is not available, the activity cannot be performed.

  • 2 Measure Requirement: Action = Action + Bonus; Bonus = Bonus + Action; Reaction = Reaction + Action
  • 3 Measure Requirement: All [3] Action Types are used in performing the activity.

iCore Action Mechanics

Aspect Fumble (*1) Fail Minimal Average Maximum Critical (*20)
Attack 1 Dmg. Full Dmg. Full Dmg. x2 & Consciousness
Skill check

Pure Luck: CHA check; DC value of 5, 10, 15, or 20. Generally any luck capability the character has (feat, racial). decreases the DC by 1 category (non cumulative decrease).


Insight is a penetrating glimpse or connection into the unfolding of The Pattern – usually through some ability and/or power. Most measures of insight are temporary – gone forever when used. Some greater ones (such as Superior Luck or Leadership) persist, and benefit the character for life. A measure of insight can benefit in the following ways:

Greater Insight

  • Advantage: Standard
  • Full Quality: A successful result does full damage.
  • Probability Increase: A check gains +4.
  • Obvious Simple: A check succeeds with minimal normal effects.

Lesser Insight


Disregard is a inability to fully grasp or disconnect with what the character is experiencing or observing in The Pattern in some way. Most measures of disregard are temporary – gone forever when used. Some greater ones persist, and penalize the character for life. A measure of disregard can penalize in the following ways:

Greater Disregard

  • Disadvantage: Standard
  • Least Quality: A successful result does minimum damage.
  • Probability Decrease: A check suffers -4.
  • Calamitous Failure: A failed check causes horrific results.