At the end of the “NWSL Regular Season” level, which ever team wants to move on to the next level - “NWSL Championship” - is going to have to beat the North Carolina Courage.
From Wikipedia:
“A fight with a boss character is commonly referred to as a boss battle or boss fight. (T)he boss enemy is generally far stronger than the opponents the player has faced up to that point. At times, bosses are very hard, even impossible to defeat without being adequately prepared and/or knowing the correct fighting approach.