Bought at a shrine, from this tree. A purchase costs up to two time chunks depending on the skill; which skills cost one and which cost two is not published. Some shrines need restoring before they can be used at all.
Effect
Increases both how often a critical hit lands and how hard it lands. No values are published.
Synergy
magicdamage
Listed among the tree's abilities but described as a stat effect. Whether it is cast on Coen or applied to a target is not published.