Great and fun code!
I tested it to a different IDE (for multiple inputs) and here are my suggestions based on my experience.
1) When I run the program, I had no idea what to input as there is no printed text in the terminal. So instead of placing those as a comment, print those texts to guide the player what kind of input is needed. Although in sololearn, it's better to leave those as a comment so it will only print the final output.
2) When taking numeral inputs, use int() function to convert the input into an integer
This way, you could compare integers to integers
🔹 if Mercy > 7:
which is more reliable than comparing numeral string to numeral string
🔸 if Mercy > "7":
This only compares the order of the character of "7" and not the integer value of it.
3) Added "- " inside input() to indicate a clearer input space for the player. For example:
Horde or Alliance?
Here is your code (with some changes based on suggestions above)