Amenominakanushi(Solarverse)/Equipment

Kusanagi-no-Tsurugi=

Poison of God
Eien no itami no noroi(永遠の痛みを与える呪い lit."Curse of the Eternal Pain") was originally made to be Samael's eternal punishment for making the First Sins and bathing humanity in it. It was supposed to be so, however beings with malevolent intentions from different mythologies such as those from the Khaos Brigade have oftened stolen some of Samael's blood due to it containing a curse so strong even Great Red flinched a little from it.

However the First Progenitor of Shintoism takes it a step further and decides to fuse completely with Samael gaining all of his powers. The reason for this to happen is that, while fighting Issei when he abosrbed a black hole, he realized the Solar God's determination and rage are too much of an obsticale for him alone. And that's how he realizes that if he is to destroy the Solar God then only the being who can 'scare' the two strongest dragons can help him achive that.

Appearance
It's true appearence is unknown, but it theoriticly should be a swerling mass of black liuqid seen in how it turns it's host's abilities and attacks to blackish color.

Forms
One of the effects of the Poison would be that it transforms it's user to a draconic hybrid, making him or her a pretty bizzarre being considering the poison itself should do them more bad then good.