Goblin Lord: Prepare to capture the Saint at the beginning!

Description

[Lord, farming, the plot is slow and the heroine is very exciting. 】
Good news: After traveling through time in the Brave Game, you can start a hearty adventure!
Bad news: Although I traveled through time, I did not become a human, but became a weak Goblin Lord!
When Gu An arrived for the first time and saw this deceitful reborn race, his mentality almost exploded.
Fortunately, the system rewarded him with a chance to change his appearance so that he would not be as ugly as a purebred goblin.
However, before Gu An could be happy for a while after finishing pinching his face, he heard a prompt from the system.
"The saint will come to the lair for adventure in half an hour."
What a bad luck!
How can the goblin defeat the saint?