Aurora Guard

Aurora Guard (アーオーラ・ガッド; Aaoora Gaddo), also known as the Guardinal of the Polar Lights is a low-tier Sacred Gear. According to Azazel this particular Sacred Gear has been getting stronger as of recent times due to the phenomenon of Sacred Gear evolution, meaning that more and more examples of this Sacred Gear have the power of a mid-tier Sacred Gear.

Summary
Wielded by knights and members of the royal guard since ancient times, this Sacred Gear is one that has known labor on different hands for a long time while other Sacred Gears had been passed down without even been awakened. According to Azazel this has allowed Aurora Guard to slowly but stedily build up strength and although the process takes a really long time, the difference in power has become notorious and it has helped Azazel understand how Sacred Gears evolve and adapt as they are passed down from wielder to wielder.

Additionally, while its base power is well among the mid-tier Sacred Gear due to the simple nature of Aurora Guard it is still categorized as a low-tier Sacred Gear.

Abilities
Aurora Guard has the ability to release a luminiscent power or "sword beam" from its edge at the wielder's command. Allowing them to augment their attacks with the radiant power or shoot them as they swing the sword while fighting. Tough aside from the normal resilience that Sacred Gears show against damage, it has no further abilities.

Forms
In its base release Aurora Guard takes the form of a double-edged sword with runes all over the length of its blade. Said blade is of silverish white color while the handle and guard of a dark blue color. It is noted to be a very balanced weapon and can be used as both one or two handed without repercutions.

Polaris Twin Radiance
Also known as the Radiant Guard of North and South. The regular Balance Breaker of Aurora Guard. It summons a secondary sword of similar properties to the original. Its base light powers are enhanced as well as the physical attributes of the wielder as if sharing with them the properties of the light it hosts. Unlike other physical enhancements however, the Balance Breaker doesn't augments the wielder's resistance to attacks so they must be careful while trading blows.

Trivia

 * The main image is from the manga Twin Star Exorcists and the wave picture is obviously from Bleach
 * Ichigo's lattest Shikai could be used as a picture of the Balance Breaker, though the small blade is too small for it
 * The name of the Sacred Gear is taken from Sugiita Gunha's move of the same name in the To aru majutsu no index light novel
 * The light described in this Sacred Gear is not the same as the light/holy attribute of angels and fallen so it's not poisonous to devils