Strides of Heresy is a Lunar item in Risk of Rain 2.
Upon pickup, the item replaces the players Utility Skill (SHIFT, by default) with Shadowfade.
Shadowfade[]
Fade away, becoming intangible and gaining 30% movement speed. Heal 25% (+25% per stack) of your maximum health. Lasts 3 (+3 per stack) seconds.