Shardblade - Capaloptocus/wordsofradiancemod GitHub Wiki
Shardblades are magical swords of great renown. Each Shardblade has its own history and often a name that has been recorded throughout the centuries. The Blades can cut almost anything inanimate, but anything alive it passes through. Whatever living thing the Blade passes through is killed - if a Shardblade sweeps through a person's arm or leg, the limb dies as surely as if it had been severed. If the Blade touches a person's spine, their eyes burn and they die.
In this mod, a Shardblade will immediately kill any living creature, with a couple of exceptions - Shardplate can block a blow from a Blade, so while the Blade will do damage, it won't immediately kill you. Further, in the cosmere, different kinds of investiture (magic) resist one another. With this in mind, an enchanted chestplate can resist a Shardblade somewhat, preventing a player or other entity from dying immediately. Similarly, several highly invested entities (Ender Dragon, Evokers, the Wither) resist this property of Blades.
The other incredible property of Blades is that they can be dismissed or summoned at will! By affixing a gemstone to the pommel of a Shardblade, a person can bond with the Blade, allowing them to dismiss the Blade, causing it to puff away into mist. They may then summon the Blade, taking ten heartbeats to do so, causing it to coalesce from mist in their hand. In this mod, if you find a Blade, you must craft it with a diamond, emerald, or amethyst shard to affix a gemstone to the pommel. Then, you may right-click to bond with the Blade (right-click a bonded blade to break the bond). While bonded, the blade may be dismissed by dropping it or using the dismiss/summon Blade key. If it's dismissed, you may re-summon it to an empty hand with the same key.