Strides of Heresy

Strides of Heresy is a Lunar item that can be obtained by completing the Blockade Breaker challenge. It replaces your utility skill with Shadowfade, an ability that gives you complete invulnerability, movement speed, and a large heal at the cost of being able to attack. Using Shadowfade is very good for retreating from a dangerous situation to recover and reassess.

Strides of Heresy's only overt downside is that it replaces your default utility skill with a very specialized alternative. Additional stacks of Strides of Heresy only increase the duration and heal of Shadowfade, making it almost entirely beneficial after the first one. Excessive stacks can result in more time out of reality than in, which is colloquially known as super boring.

Synergies

 * This item is especially useful for Commando and REX, since the utility skill it provides is a direct upgrade to their default utility skills. For other characters, such as Huntress and MUL-T, this item is more of a side-grade, so it should only be picked up if you don't have a reliable source of healing or just personally like the effect it gives. On everyone else, the skill is a direct downgrade. Characters like Mercenary and Loader have their damage outputs substantially lowered as a result of having their shift skills replaced.

Trivia

 * The foreign arm resembles that of the Alloy Vultures.