Lustres, once upon time, had the most well trained army in the sunset continent. This is due to the diligence of Lord Lustre. Their heavy cavalry was the nightmare of the realm. They never lost a battle in gold land.
However, this had a catch.
Not even the most brave soldier's heart could stay calm when a half a ton gigantic horse covered in armor all over its body galloping towards him along with a full plated knight on it's body coming for your head with a wicked sharp sword.
This kind of effect is achieved all too easily in goldland, known for its mineral deposits, and grassy plains. Note, 'the grass' and the ' the plains'. The grass is yellow, the earth is dried up and hard. Thus, it could support galloping of a fully plated heavy horse with iron armor.