Subsystem(Ironwrought)

You can use this subsystem to maintain concentration on a cantrip. Effects that would cause you to make a Constitution saving throw to maintain your concentration apply to it, and it makes its save with a +0 bonus. It can maintain concentration on only one cantrip at a time. • If the subsystem is not concentrating on a spell, you can use it to make a Intelligence or Wisdom check (no action required) once per turn on your turn. • Each time you fail at the same specific task during your turn (saving against the same spell effect, attacking the same target, searching for a specific hidden creature), if you attempt the exact same task on your next turn, you can roll an additional die, taking the higher die. All additional dice are reset when you succeed the task.

FROM

 Kibbles’ Compendium of Craft and Creation