The Grim is an unified group of predatory dragons that live in the dark depths of the world. It was created by a " Triple-Slasher" by the name of Crimson Slash. Crimson Slash believed that inorder to survive The Scorching. 

So, Crimson Slash became the leader of the Triple-Slashers, which also made her the leader of the  insubordinate tribes of the Triple-Slashers: The Amber Casters, The Thunder Horns and The Camo Assasins, whom were all conquered by the previous leaders of the Triple-Slashers by either combat or by an alliance. She then conceived many of the other tribes to join her through her cunning, battle prowess and charm. The only tribe that didn't join her were The Rip-Roarers, who didn't see the need to join the Grim. 

With the battle experience and power that she obtained, Crimson Slasher allied herself with the Pyrrhian Dragons, inorder to take out the threat of the scavengers. Crimson led her army to attack vital supply routes as well as disabling the defences of the scavenger dens, so that the other dragons can rip through their defences and kill many of the pest. However, the scavengers retaliated by viciously attacking the vulnerable Rip-Roarer wiping the majority of them off the face of the land. 

When the Scorching was done, Crimson made a deal with the Pyrrhian dragons, which involves the Grim living in the caves and dark reaches of the world, while being able to hunt dragons though at a reasonably decreased rate. In exchange, the Pyrrhian dragons got the advance technology that the Grim had created at the time.

Overtime, the Grim's leader passed away and her daughter became queen. However, unlike her mother, Devil-killer,  was more paranoid and had the tribe become more secretive and overtime was forgotten to al, of Pyrrhia. While the Grim were forgotten in Pyrrhia, Pantala still feared the Grim, although the Grim live in the forests for mast of time, so when Queen Wasp destroyed  the forests the Grim followed the retreating forest till they reached the Poison Jungle, where they started to pick off entire swarms of HiveWings untill Wasp was forced to call off the destruction.

The current leader of the Grim is Victory Strike.