Sword of the sun
A weapon based on an old legend, this blade possesses a golden Cross-guard, and a shimmering blade. It is created through an intense mixture of Lunacy and Deep communion.
The Cross-guard is imbued with a lunacy ritual, allowing it to absorb sunlight, and store it away, for it is golden, just as the sun is. This light can be released later, channeled through the blade. The blade itself undergoes a ritual to grant it longevity, before a deep being is placed in it, which turns it transparent. This being is paid via soul dregs. The key feature of the Sword of the Sun is it's ability to channel the stored sunlight into either blasts of blazing hot light, or simply into the blade, covering it in golden light, capable of damaging or burning through almost anything. (Could be persuaded to make this pure lunacy. And yes, this is basically meant to be like Excalibur from fate. A giant laser of golden light that takes ages to charge up and fire.)
(more to come, sword of air, spear of lightning, and a few others)
Sword of air
A simple enough concept, using a Lunacy transformation to counteract the decay caused by a Deep being inhabiting an object. By using a transformation to reinforce the concept of longevity in a sword, it can be made to transform into a silvery blade which doesn't rust or decay normally, though it can be chipped and broken. The deep being inhabiting it has power over wind, and enhances the piercing abilities of the sword, allowing it to circumvent or pierce through most defenses. This Being can get even stronger as the sword is used to kill, by absorbing the soul dregs from those it kills.
Spear of lightning
"I am powerless. Through this sacrifice, give me the power I speak" Man cries to the heavens.
This is the answer. A being of lightning bound into a spear, granting man power. Power to kill.
Inhabited arrow
An arrow inhabited and guided by a being of the deep, coerced by rituals. The weakest of beings, aimed like an attack dog. The resulting arrows will hit whatever target the user wills. Within reason. They can curve around, warping and twirling through the air to hit with impossible accuracy. But only once.