This enchantment can only be applied to a suit of Medium Armor.
This is an Apprentice-level recipe. If you are crafting this item, you can do so without consuming any materials, but doing so counts as crafting 2 items instead of 1 for the purposes of calculating how many items you can craft during Downtime. You cannot craft this item for free during the course of an event.
You can use the Impaling Blow Technique as if you knew it.