Etos

Etos is the first "boss" for Yugi's campaign in The Falsebound Kingdom. When you first duel him, his monsters are

Basic Insect (Lvl 1, 600HP, 3 AP, 700ATK, 900DEF) Blackland Fire Dragon (Lvl 2, 874HP, 2 AP, 1749ATK, 1057DEF) Swordsman from a Foreign Land (Lvl 1, 490HP, 3 AP, 450ATK, 450DEF)

You get his Blackland Fire Dragon after you beat him.