Gravity Bomb

Information
Gravity Bombs are explosives that make black holes. Almost anything, hit with this, will die.

How to use it
Use the keyword, {Black Plate} than throw it.

Volume 4
Before Rin left the Cave of Greed, he gave them to Keima

Volume 5
When Aidy attacked the dungeon, Keima used it to kill the Living Armor she was in.