Absorption Line

The Absorption Line, also known as the Black Dragon's Pulse is a Sacred Gear wielded by Genshirou Saji of the Student Council and the pawn of Sona Sitri. It holds a part of Prison Dragon Vritra's soul.

Summary
In Volume 3 of the Light Novels, it was revealed that Saji possesses a Dragon-type Sacred Gear, Absorption Line. He used it to connect a line to Freed Sellzen to prevent him from escaping and absorb his power gradually.

In Volume 4, Azazel revealed that Absorption Line holds the power of one of the Five Great Dragon Kings, Vritra. He also told Saji new ways to use Absorption Line.

In Volume 5, Saji connected the Absorption Line's line to his heart absorb his own life force to power up his demonic power. He also connected a detached line to Issei Hyoudou that gradually sucked his blood to a container held by his teammate.

In Volume 14, Saji was able to produce multiple lines and connect it to Issei and the the other members of so that Issei can transfer his boosted power to everyone at the same time.

Appearance
It looks like a small, cute lizard (more specifically, a chameleon) with violet eyes and a deformed face that appears on the user's hand.

Abilities
Absorption Line can produce lines that can suck the power of objects or beings its connected to. It can also detach that line and connect it to other objects or beings to transfer the power it sucked. It can also be used to suck the blood of a person.