Gelmud/Chronology

Forest Disturbance Arc
For 300 years, he had been planning to create a species war by naming certain monsters born from the goblins, lizardmen, and other such races. However, he lacked the resources to put it into action, so Gelmud contacted Demon Lord Clayman for assistance and was later hired by him.

After enlisting support from one of the Demon Lords, he set out to name as many monsters as possible, and his plan slowly began to unfold. He methodically heated up the situation between the monster inhabitants of the Great Forest of Jura. Gelmud thought that since he named and grew his subordinates himself, they would remain loyal to him even if they become Demon Lords. The method is servile, it's petty, and it doesn't seem to be a straight attack, but it's planned and solid, and Gelmud has a series of names as part of his career plan to become a Demon Lord.

However, Veldora's disappearance caused his plans to spiral out of control because of the increase in monster activity, so he was obligated to improvise in order to not perish to the hands of Clayman, who invested a lot of resources into the plan and would be upset by failure. In his new improvised plan, Gelmud would attempt to create a Demon Lord from the Orc tribe, and control them to start the war.

When the time came, however, a slime named Rimuru quickly gained control over Jura Forest and formed an alliance with the creatures of the forest to fight back. Enraged, Gelmud entered the battlefield, and ranted about how the alliance ruined his plan. Under the effects of the Starved skill, the Orc Lord Geld decapitated and devoured him.