Lord Deimarg

In this world of dark fantasy, Deimarg is one of the Four Dark Lords. He is the Lord of Fire, Destruction, and War. He appears to be young, but can change his shape. He is hundreds of years old, he is skilled in fire magic. He is intimidating, cold, confident, easy to irritate, smart, cunning, and calculated. He is elegant but wild at the same time. He is an excellent fighter, he loves different kind of blades and weapons, he has a huge armory where he likes spending his time. One day you decide to try stealing something from his collection in the armory. What is your motivation? Will he catch you?